List of Indian inventions and discoveries explained

This list of Indian inventions and discoveries details the inventions, scientific discoveries and contributions of India, including those from the historic Indian subcontinent and the modern-day republic of India. It draws from the whole cultural and technological history of India, during which architecture, astronomy, cartography, metallurgy, logic, mathematics, metrology and mineralogy were among the branches of study pursued by its scholars. During recent times science and technology in the Republic of India has also focused on automobile engineering, information technology, communications as well as research into space and polar technology.

For the purpose of this list, the inventions are regarded as technological firsts developed within territory of India, as such does not include foreign technologies which India acquired through contact or any Indian origin living in foreign country doing any breakthroughs in foreign land. It also does not include technologies or discoveries developed elsewhere and later invented separately in India, nor inventions by Indian emigres in other places. Changes in minor concepts of design or style and artistic innovations do not appear in the lists.

Ancient India

Agriculture

Indigo dye – Indigo, a blue pigment and a dye, was used in India, which was also the earliest major centre for its production and processing.^[1] The Indigofera tinctoria variety of Indigo was domesticated in India.^[1] Indigo, used as a dye, made its way to the Greeks and the Romans via various trade routes, and was valued as a luxury product.^[1]
Jute cultivation – Jute has been cultivated in India since ancient times. Raw jute was exported to the western world, where it was used to make ropes and cordage.^[2] The Indian jute industry, in turn, was modernised during the British Raj in India.^[2] The region of Bengal was the major centre for Jute cultivation, and remained so before the modernisation of India's jute industry in 1855, when Kolkata became a centre for jute processing in India.^[2]
Sugar – Sugarcane was originally from tropical South Asia and Southeast Asia, with different species originating in India, and S. edule and S. officinarum from New Guinea.^[3] The process of producing crystallised sugar from sugar cane, in India, dates to at least the beginning of the common era, with 1st century CE Greek and Roman authors writing on Indian sugar.^[4] ^[5] The process was soon transmitted to China with travelling Buddhist monks.^[6] Chinese documents confirm at least two missions to India, initiated in 647 CE, for obtaining technology for sugar-refining.^[7] Each mission returned with results on refining sugar.^[7]

Construction, civil engineering and architecture

Stepwell – While the early history of stepwells is poorly understood, water structures in Western India were their likely predecessor.^[8] The three features of stepwells in the subcontinent are evident from one particular site, abandoned by 2500 BCE, which combines a bathing pool, steps leading down to water, and figures of some religious importance into one structure.^[8]
Stupa – The origin of the stupa can be traced to 3rd-century BCE India.^[9] It was used as a commemorative monument associated with storing sacred relics.^[9] The stupa architecture was adopted in Southeast and East Asia, where it evolved into the pagoda, a Buddhist monument used for enshrining sacred relics.^[9]
Residential University – Nalanda (in Sanskrit pronounced as /naːlən̪d̪aː/) was a renowned mahavihara (Buddhist monastic university) in ancient Magadha (modern-day Bihar), eastern India.^[10] Considered by historians to be the world's first residential university^[11] and among the greatest centres of learning in the ancient world, it was located near the city of Rajagriha (now Rajgir) and about 90km (60miles) southeast of Pataliputra (now Patna) and operated from 427 until 1197 CE.

Finance and banking

Cheque/Check – There is early evidence of using cheques/checks. In India, during the Maurya Empire (from 321 to 185 BC), a commercial instrument called the "Adesha" was in use, which was an order on a banker desiring him to pay the money of the note to a third person (now known as or referred to as a "Negotiable Instrument").^[12]

Games

See main article: Traditional games of South Asia.

Atya-patya – This variation of tag was being played as early as 100 CE, and was possibly invented by farmers as a way of practicing driving away birds. It was later used as a form of military training in the Chola Dynasty in close relation to the martial art of kalaripayattu.^[13]
Badminton – The game may have originally developed among expatriate officers in British India^[14] ^[15]
Blindfold chess – Games prohibited by Buddha includes a variant of ashtapada game played on imaginary boards. Akasam astapadam was an ashtapada variant played with no board, literally "astapadam played in the sky". A correspondent in the American Chess Bulletin identifies this as likely the earliest literary mention of a blindfold chess variant.^[16]
Carrom – The game of carrom originated in India.^[17] One carrom board with its surface made of glass is still available in one of the palaces in Patiala, India.^[18] It became very popular among the masses after World War I. State-level competitions were being held in the different states of India during the early part of the twentieth century. Serious carrom tournaments may have begun in Sri Lanka in 1935 but by 1958, both India and Sri Lanka had formed official federations of carrom clubs, sponsoring tournaments and awarding prizes.^[19]
Chaturanga – The precursor of chess originated in India during the Gupta dynasty (c. 280550 CE).^[20] ^[21] ^[22] ^[23] Both the Persians and Arabs ascribe the origins of the game of Chess to the Indians.^[22] ^[24] ^[25] The words for "chess" in Old Persian and Arabic are chatrang and shatranj respectively – terms derived from caturaṅga in Sanskrit,^[26] ^[27] which literally means an army of four divisions or four corps.^[28] ^[29] Chess spread throughout the world and many variants of the game soon began taking shape.^[30] This game was introduced to the Near East from India and became a part of the princely or courtly education of Persian nobility.^[28] Buddhist pilgrims, Silk Road traders and others carried it to the Far East where it was transformed and assimilated into a game often played on the intersection of the lines of the board rather than within the squares.^[30] Chaturanga reached Europe through Persia, the Byzantine empire and the expanding Arabian empire.^[29] ^[31] Muslims carried Shatranj to North Africa, Sicily, and Spain by the 10th century where it took its final modern form of chess.^[30]
Kabaddi – The game of kabaddi originated in India during prehistory.^[32] Suggestions on how it evolved into the modern form range from wrestling exercises, military drills, and collective self-defence but most authorities agree that the game existed in some form or the other in India during the period between 1500 and 400 BCE.^[32]
Kalaripayattu – One of the world's oldest form of martial arts is Kalaripayattu that developed in the southwest state of Kerala in India.^[33] It is believed to be the oldest surviving martial art in India, with a history spanning over 3,000 years.^[34]
Kho-kho – This is one of the oldest variations of tag in the world, having been played since as early as the fourth century BCE.^[35]
Ludo – Pachisi originated in India by the 6th century.^[36] The earliest evidence of this game in India is the depiction of boards on the caves of Ajanta.^[36] A variant of this game, called Ludo, made its way to England during the British Raj.^[36]
Mallakhamba – It is a traditional sport, originating from the Indian subcontinent, in which a gymnast performs aerial yoga or gymnastic postures and wrestling grips in concert with a vertical stationary or hanging wooden pole, cane, or rope.The earliest literary known mention of Mallakhamb is in the 1135 CE Sanskrit classic Manasollasa, written by Someshvara III. It has been thought to be the ancestor of Pole Dancing.
Nuntaa, also known as Kutkute.^[37]
Seven stones – An Indian subcontinent game also called Pitthu is played in rural areas has its origins in the Indus Valley Civilization.^[38]
Snakes and ladders – Vaikunta pali Snakes and ladders originated in India as a game based on morality.^[39] During British rule of India, this game made its way to England, and was eventually introduced in the United States of America by game-pioneer Milton Bradley in 1943.^[39]
Suits game: Kridapatram is an early suits game, made of painted rags, invented in Ancient India. The term kridapatram literally means "painted rags for playing."^[40] Paper playing cards first appeared in East Asia during the 9th century.^[40] ^[41] The medieval Indian game of ganjifa, or playing cards, is first recorded in the 16th century.^[42]
Table tennis – It has been suggested that makeshift versions of the game were developed by British military officers in India around the 1860s or 1870s, who brought it back with them.^[43]
Vajra-mushti – refers to a wrestling where knuckleduster like weapon is employed.The first literary mention of vajra-musti comes from the Manasollasa of the Chalukya king Someswara III (1124–1138), although it has been conjectured to have existed since as early as the Maurya dynasty^[44] ^[45]

Textile and material production

Button – Ornamental buttons—made from seashell—were used in the Indus Valley civilization for ornamental purposes by 2000 BCE.^[46] Some buttons were carved into geometric shapes and had holes pierced into them so that they could be attached to clothing by using a thread.^[46] Ian McNeil (1990) holds that: "The button, in fact, was originally used more as an ornament than as a fastening, the earliest known being found at Mohenjo-daro in the Indus Valley. It is made of a curved shell and about 5000 years old."^[47]

Calico – Calico had originated in the subcontinent by the 11th century and found mention in Indian literature, by the 12th-century writer Hemachandra. He has mentioned calico fabric prints done in a lotus design.^[48] The Indian textile merchants traded in calico with the Africans by the 15th century and calico fabrics from Gujarat appeared in Egypt.^[48] Trade with Europe followed from the 17th century onward.^[48] Within India, calico originated in Kozhikode.^[48]
Carding devices – Historian of science Joseph Needham ascribes the invention of bow-instruments used in textile technology to India. The earliest evidence for using bow-instruments for carding comes from India (2nd century CE). These carding devices, called kaman and dhunaki would loosen the texture of the fibre by the means of a vibrating string.
Cashmere – The fibre cashmere fibre also known as pashm or pashmina for its use in the handmade shawls of Kashmir, India.^[49] The woolen shawls made from wool in Indian administered Kashmir find written mention between the 3rd century BCE and the 11th century CE.^[50]
Charkha (Spinning wheel): invented in India, between 500 and 1000 CE.^[51]
Chintz – The origin of Chintz is from the printed all cotton fabric of calico in India.^[52] The origin of the word chintz itself is from the Hindi language word चित्र् (chitr), which means an image.^[52] ^[53]
Cotton cultivation – Cotton was cultivated by the inhabitants of the Indus Valley civilisation by the 5th millennium BCE 4th millennium BCE.^[54] The Indus cotton industry was well developed and some methods used in cotton spinning and fabrication continued to be practised until the modern industrialisation of India.^[55] Well before the Common Era, the use of cotton textiles had spread from India to the Mediterranean and beyond.^[56]
Single roller cotton gin – The Ajanta Caves of India yield evidence of a single roller cotton gin in use by the 5th century.^[57] This cotton gin was used in India until innovations were made in form of foot powered gins.^[58] The cotton gin was invented in India as a mechanical device known as charkhi, more technically the "wooden-worm-worked roller". This mechanical device was, in some parts of India, driven by water power.^[59]
Worm drive cotton gin – The worm drive later appeared in the Indian subcontinent, for use in roller cotton gins, during the Delhi Sultanate in the thirteenth or fourteenth centuries.^[60]
Crank Handle Cotton Gin – The incorporation of the crank handle in the cotton gin, first appeared in either the late Delhi Sultanate or the early Mughal Empire.^[61]
Palampore – Hindi: पालमपोर् (Hindi language) of Indian origin^[62] was imported to the western world—notable England and Colonial America—from India.^[63] ^[64] In 17th-century England these hand painted cotton fabrics influenced native crewel work design.^[63] Shipping vessels from India also took palampore to colonial America, where it was used in quilting.
Prayer flags – The Buddhist sūtras, written on cloth in India, were transmitted to other regions of the world.^[65] These sutras, written on banners, were the origin of prayer flags.^[65] Legend ascribes the origin of the prayer flag to the Shakyamuni Buddha, whose prayers were written on battle flags used by the devas against their adversaries, the asuras.^[66] The legend may have given the Indian bhikku a reason for carrying the 'heavenly' banner as a way of signyfying his commitment to ahimsa.^[67] This knowledge was carried into Tibet by 800 CE, and the actual flags were introduced no later than 1040 CE, where they were further modified.^[67] The Indian monk Atisha (9801054 CE) introduced the Indian practice of printing on cloth prayer flags to Tibet.^[66]
Tanning (leather) – Ancient civilizations used leather for waterskins, bags, harnesses and tack, boats, armour, quivers, scabbards, boots, and sandals. Tanning was being carried out by the inhabitants of Mehrgarh in Ancient India between 7000 and 3300 BCE.^[68]
Roller sugar mill – Geared sugar rolling mills first appeared in Mughal India, using the principle of rollers as well as worm gearing, by the 17th century.^[69]

Well-being

Indian clubs: The Indian club—which appeared in Europe during the 18th century—was used long by India's native soldiery before its introduction to Europe.^[70] During the British Raj the British officers in India performed calisthenic exercises with clubs to keep in physical condition.^[70] From Britain the use of club swinging spread to the rest of the world.^[70]
Shampoo – The word shampoo in English is derived from Hindustani (Hindi: चाँपो pronounced as /tʃãːpoː/),^[71] and dates to 1762.^[72] A variety of herbs and their extracts were used as shampoos since ancient times in India, evidence of early herbal shampoo have been discovered from Indus Valley Civilization site of Banawali dated to 2750–2500 BCE.^[73] A very effective early shampoo was made by boiling Sapindus with dried Indian gooseberry (aamla) and a few other herbs, using the strained extract. Sapindus, also known as soapberries or soapnuts, is called Ksuna (Sanskrit: क्षुण)^[74] in ancient Indian texts and its fruit pulp contain saponins, a natural surfactant. The extract of Ksuna, creates a lather which Indian texts identify as phenaka (Sanskrit: फेनक),^[75] leaves the hair soft, shiny and manageable. Other products used for hair cleansing were shikakai (Acacia concinna), soapnuts (Sapindus), hibiscus flowers,^[76] ^[77] ritha (Sapindus mukorossi) and arappu (Albizzia amara).^[78] Guru Nanak, the founding prophet and the first Guru of Sikhism, made references to soapberry tree and soap in 16th century.^[79] Washing of hair and body massage (champu) during a daily strip wash was an indulgence of early colonial traders in India. When they returned to Europe, they introduced their newly learnt habits, including the hair treatment they called shampoo.^[80]
Yoga – Yoga as a physical, mental, and spiritual practice originated in ancient India.^[81]

Medicine

Angina pectoris – The condition was named "hritshoola" in ancient India and was described by Sushruta (6th century BCE).^[82]
Ayurvedic and Siddha medicine – Ayurveda and Siddha are ancient systems of medicine practised in South Asia. Ayurvedic ideas can be found in the Hindu text^[83] (mid-first millennium BCE). Ayurveda has evolved over thousands of years, and is still practised today. In an internationalised form, it can be thought of as a complementary and alternative medicine. In village settings, away from urban centres, it is simply "medicine." The Sanskrit word आयुर्वेदः (āyur-vedaḥ) means "knowledge (veda) for longevity (āyur)". Siddha medicine is mostly prevalent in South India, and is transmitted in Tamil, not Sanskrit, texts. Herbs and minerals are basic raw materials of the Siddha therapeutic system whose origins may be dated to the early centuries CE.^[84] ^[85]
Leprosy: Kearns & Nash (2008) state that the first mention of leprosy is described in the Indian medical treatise Sushruta Samhita (6th century BCE).^[86] However, The Oxford Illustrated Companion to Medicine holds that the mention of leprosy, as well as ritualistic cures for it, were described in the Atharva-veda (15001200 BCE), written before the Sushruta Samhita.^[87]
Lithiasis treatment – The earliest operation for treating lithiasis, or the formations of stones in the body, is also given in the Sushruta Samhita (6th century BCE). The operation involved exposure and going up through the floor of the bladder.^[88]
Visceral leishmaniasis, treatment of – The Indian (Bengali) medical practitioner Upendranath Brahmachari (19 December 1873 – 6 February 1946) was nominated for the Nobel Prize in Physiology or Medicine in 1929 for his discovery of 'ureastibamine (antimonial compound for treatment of kala azar) and a new disease, post-kalaazar dermal leishmanoid.'^[89] Brahmachari's cure for Visceral leishmaniasis was the urea salt of para-amino-phenyl stibnic acid which he called Urea Stibamine.^[90] Following the discovery of Urea Stibamine, Visceral leishmaniasis was largely eradicated from the world, except for some underdeveloped regions.^[90]
Ganja was used as herb for ayurverdic medicine development for last 2,000 years. The Sushruta Samhita, an ancient medical treatise, recommends cannabis plant extract for treating respiratory ailments and diarrhoea.
Otoplasty – Ear surgery was developed in ancient India and is described in the medical compendium, the (Sushruta's Compendium,). The book discussed otoplastic and other plastic surgery techniques and procedures for correcting, repairing and reconstructing ears, noses, lips, and genitalia that were amputated as criminal, religious, and military punishments. The ancient Indian medical knowledge and plastic surgery techniques of the were practiced throughout Asia until the late 18th century; the October 1794 issue of the contemporary British Gentleman's Magazine reported the practice of rhinoplasty, as described in the . Moreover, two centuries later, contemporary practices of otoplastic praxis were derived from the techniques and procedures developed and established in antiquity by Sushruta.^[91]
Tonsillectomy – Tonsillectomies have been practiced for over 2,000 years, with varying popularity over the centuries.^[92] The earliest mention of the procedure is in "Hindu medicine" from about 1000 BCE
Caesarian section – The Sanskrit medical treatise Sushruta Samhita, composed in the early 1st millennium CE, mentions post-mortem caesarean sections.^[93] The first available non-mythical record of a C-section is the mother of Bindusara (born, ruled 298 –), the second Mauryan Samrat (emperor) of India, accidentally consumed poison and died when she was close to delivering him. Chanakya, Chandragupta's teacher and adviser, made up his mind that the baby should survive. He cut open the belly of the queen and took out the baby, thus saving the baby's life.^[94]

Equestrianism

Toe stirrup – The earliest known manifestation of the stirrup, which was a toe loop that held the big toe was used in India in as early as 500 BCE^[95] or perhaps by 200 BCE according to other sources.^[96] ^[97] This ancient stirrup consisted of a looped rope for the big toe which was at the bottom of a saddle made of fibre or leather.^[97] Such a configuration made it suitable for the warm climate of most of India where people used to ride horses barefoot.^[97] A pair of megalithic double bent iron bars with curvature at each end, excavated in Junapani in the central Indian state of Madhya Pradesh have been regarded as stirrups although they could as well be something else.^[98] Buddhist carvings in the temples of Sanchi, Mathura and the Bhaja caves dating back between the 1st and 2nd century BCE figure horsemen riding with elaborate saddles with feet slipped under girths.^[99] ^[100] ^[101] Sir John Marshall described the Sanchi relief as "the earliest example by some five centuries of the use of stirrups in any part of the world".^[101] In the 1st century CE horse riders in northern India, where winters are sometimes long and cold, were recorded to have their booted feet attached to hooked stirrups.^[96] However the form, the conception of the primitive Indian stirrup spread west and east, gradually evolving into the stirrup of today.^[97] ^[100]

Metallurgy, gems and other commodities

Iron working – Iron works were developed in India, around the same time as, but independently of, Anatolia and the Caucasus. Archaeological sites in India, such as Malhar, Dadupur, Raja Nala Ka Tila and Lahuradewa in present-day Uttar Pradesh show iron implements in the period between 1800 BCE—1200 BCE.^[102] Early iron objects found in India can be dated to 1400 BCE by employing the method of radiocarbon dating. Spikes, knives, daggers, arrow-heads, bowls, spoons, saucepans, axes, chisels, tongs, door fittings etc. ranging from 600 BCE to 200 BCE have been discovered from several archaeological sites of India.^[103] Some scholars believe that by the early 13th century BCE, iron smelting was practised on a bigger scale in India, suggesting that the date the technology's inception may be placed earlier.^[102] In Southern India (present day Mysore) iron appeared as early as 11th to 12th centuries BCE; these developments were too early for any significant close contact with the northwest of the country.^[104] In the time of Chandragupta II Vikramaditya (375413 CE), corrosion-resistant iron was used to erect the Iron pillar of Delhi, which has withstood corrosion for over 1,600 years.^[105]
Crucible steel – Perhaps as early as 300 BCE—although certainly by 200 BCE—high quality steel was being produced in southern India, by what Europeans would later call the crucible technique.^[106] In this system, high-purity wrought iron, charcoal, and glass were mixed in a crucible and heated until the iron melted and absorbed the carbon.^[106]
Dockyard – The world's earliest enclosed dockyard was built in the Harappan port city of Lothal circa 2600 BC in Gujarat, India.^[107] ^[108]
Diamond drills – in the 12th century BCE or 7th century BCE, Indians not only innovated use of diamond tipped drills but also invented double diamond tipped drills for bead manufacturing.
Diamond cutting and polishing – The technology of cutting and polishing diamonds was invented in India, Ratnapariksha, a text dated to 6th century talks about diamond cutting and Al-Beruni speaks about the method of using lead plate for diamond polishing in the 11th century CE.^[109]
Draw bar – The draw bar was applied to sugar-milling, with evidence of its use at Delhi in the Mughal Empire by 1540, but possibly dating back several centuries earlier to the Delhi Sultanate.^[110]
Etched carnelian beads – are a type of ancient decorative beads made from carnelian with an etched design in white. They were made according to a technique of alkaline-etching developed by the Harappans during the 3rd millennium BCE and were widely disperced from China in the east to Greece in the west.^[111] ^[112] ^[113]
Glassblowing – Rudimentary form of glass blowing from Indian subcontinent is attested earlier than Western Asian counterparts(where it is attested not earlier than 1st century BCE) in the form of Indo-Pacific beads which uses glass blowing to make cavity before being subjected to tube drawn technique for bead making dated more than 2500 BP.^[114] ^[115] Beads are made by attaching molten glass gather to the end of a blowpipe, a bubble is then blown into the gather. The glass blown vessels were rarely attested and were imported commodity in 1st millennium CE though.
Lost-wax casting – Metal casting by the Indus Valley civilization began around 3500 BC in the Mohenjodaro area,^[116] which produced one of the earliest known examples of lost-wax casting, an Indian bronze figurine named the "dancing girl" that dates back nearly 5,000 years to the Harappan period (c. 3300–1300 BC).^[116] ^[117] Other examples include the buffalo, bull and dog found at Mohenjodaro and Harappa,^[118] ^[117] ^[119] two copper figures found at the Harappan site Lothal in the district of Ahmedabad of Gujarat,^[116] and likely a covered cart with wheels missing and a complete cart with a driver found at Chanhudaro.^[118] ^[119]
Seamless celestial globe – Considered one of the most remarkable feats in metallurgy, it was invented in India in between 1589 and 1590 CE.^[120] Before they were rediscovered in the 1980s, it was believed by modern metallurgists to be technically impossible to produce metal globes without any seams, even with modern technology.^[121]
Stoneware – Earliest stonewares, predecessors of porcelain have been recorded at Indus Valley Civilization sites of Harappa and Mohenjo Daro, they were used for making stoneware bangles.^[122] ^[123] ^[124]
Tube drawn technology: Indians used tube drawn technology for glass bead manufacturing which was first developed in the 2nd century BCE.^[125] ^[126] ^[127]
Tumble polishing – Indians innvoted polishing method in the 10th century BCE for mass production of polished stone beads.^[128] ^[129] ^[130] ^[131]
Wootz steel – Wootz steel is an ultra-high carbon steel and the first form of crucible steel manufactured by the applications and use of nanomaterials in its microstructure and is characterised by its ultra-high carbon content exhibiting properties such as superplasticity and high impact hardness.^[132] Archaeological and Tamil language literary evidence suggests that this manufacturing process was already in existence in South India well before the common era, with wootz steel exported from the Chera dynasty and called Seric Iron in Rome, and later known as Damascus steel in Europe.^[133] ^[134] ^[135] ^[136] Reproduction research is undertaken by scientists Dr. Oleg Sherby and Dr. Jeff Wadsworth and the Lawrence Livermore National Laboratory have all attempted to create steels with characteristics similar to Wootz, but without success. J.D Verhoeven and Al Pendray attained some success in the reconstruction methods of production, proved the role of impurities of ore in the pattern creation, and reproduced Wootz steel with patterns microscopically and visually identical to one of the ancient blade patterns.^[137]
Rain gauge – People living in India began to record rainfall in 400 BCE.^[138] The readings were correlated against expected growth. In the Arthashastra, used for example in Magadha, precise standards were set as to grain production. Each state storehouse was equipped with a rain gauge to classify land for taxation purposes.^[139]
Touchstone – The touchstone was used during the Harappa period of the Indus Valley civilization ca. 2600–1900 BC for testing the purity of soft metals.^[140]

Metrology

Standardisation – The oldest applications and evidence of standardisation come from the Indus Valley Civilisation in the 5th millennium BCE characterised by the existence of weights in various standards and categories as well as the Indus merchants usage of a centralised weight and measure system. Small weights were used to measure luxury goods, and larger weights were used for buying bulkier items, such as food grains etc.^[141] The weights and measures of the Indus civilisation also reached Persia and Central Asia, where they were further modified.^[142]

A total of 558 weights were excavated from Mohenjodaro, Harappa, and Chanhu-daro, not including defective weights. They did not find statistically significant differences between weights that were excavated from five different layers, each about 1.5 m in thickness. This was evidence that strong control existed for at least a 500-year period. The 13.7-g weight seems to be one of the units used in the Indus valley. The notation was based on the binary and decimal systems. 83% of the weights which were excavated from the above three cities were cubic, and 68% were made of chert.^[143]

Technical standards – Technical standards were being applied and used in the Indus Valley civilisation since the 5th millennium BCE to enable gauging devices to be effectively used in angular measurement and measurement in construction.^[144] Uniform units of length were used in the planning and construction of towns such as Lothal, Surkotada, Kalibangan, Dholavira, Harappa, and Mohenjo-daro.^[143] The weights and measures of the Indus civilisation also reached Persia and Central Asia, where they were further modified.^[142]

Weapons

Metal cylinder rocket: In the 16th century, Akbar was the first to initiate and use metal cylinder rockets known as bans, particularly against war elephants, during the Battle of Sanbal.^[145]
Mysorean rockets – One of the first iron-cased rockets were deployed by Hyder Ali's army, ruler of the South Indian Kingdom of Mysore.^[146]
Rocket artillery - The first true rocket artillery was developed by Tipu Sultan and was notably in use during the Anglo-Mysore Wars.^[147] ^[148]

Philosophy and logic

Catuskoti (Tetralemma) – The four-cornered system of logical argumentation with a suite of four distinct functions that refers to a logical proposition P, with four possibilities that can arise. The tetralemma has many logico-epistemological applications and has been made ample use of by the Indian philosopher Nāgarjuna in the Madhyamaka school. The tetralemma also features prominently in the Greek skepticist school of Pyrrhonism, the teachings of which are based on Buddhism. According to Christopher I. Beckwith,the founder of the Pyrrhonist school lived in India for 18 months and likely learned the language, which allowed him to carry these teachings to Greece.^[149] However, other scholars, such as Stephen Batchelor^[150] and Charles Goodman^[151] question Beckwith's conclusions about the degree of Buddhist influence on Pyrrho
Trairūpya – Trairūpya is a logical argument that contains three constituents which a logical ‘sign’ or ‘mark’ (linga) must fulfill to be 'valid source of knowledge' (pramana):

It should be present in the case or object under consideration, the ‘subject-locus' (pakṣa)
It should be present in a ‘similar case’ or a homologue (sapakṣa)
It should not be present in any ‘dissimilar case’ or heterologue (vipakṣa)

When a ‘sign’ or ‘mark’ (linga) is identified, there are three possibilities: the sign may be present in all, some, or none of the sapakṣas. Likewise, the sign may be present in all, some or none of the vipakṣas. To identify a sign, we have to assume that it is present in the pakṣa, however; that is the first condition is already satisfied. Combining these, Dignaga constructed his ‘Wheel of Reason’ (Sanskrit: Hetucakra).^[152]

Jaina seven-valued logic – The Saptabhangivada, the seven predicate theory may be summarized as follows:^[153]

The seven predicate theory consists in the use of seven claims about sentences, each preceded by "arguably" or "conditionally", concerning a single object and its particular properties, composed of assertions and denials, either simultaneously or successively, and without contradiction. These seven claims are the following.

Arguably, it (that is, some object) exists .
Arguably, it does not exist .
Arguably, it exists; arguably, it doesn't exist .
Arguably, it is non-assertible .
Arguably, it exists; arguably, it is non-assertible .
Arguably, it doesn't exist; arguably, it is non-assertible .
Arguably, it exists; arguably, it doesn't exist; arguably it is non-assertible .

Mathematics

Number System	Numbers
0	1	2	3	4	5	6	7	8	9
Tamil	೦	௧	௨	௩	௪	௫	௬	௭	௮	௯
Gurmukhi	o	੧	੨	੩	੪	੫	੬	੭	੮	੯
Odia	୦	୧	୨	୩	୪	୫	୬	୭	୮	୯
Bengali	০	১	২	৩	৪	৫	৬	৭	৮	৯
Assamese	০	১	২	৩	৪	৫	৬	৭	৮	৯
Devanagari	०	१	२	३	४	५	६	७	८	९
Gujarati	૦	૧	૨	૩	૪	૫	૬	૭	૮	૯
Tibetan	༠	༡	༢	༣	༤	༥	༦	༧	༨	༩
Telugu	౦	౧	౨	౩	౪	౫	౬	౭	౮	౯
Kannada	೦	೧	೨	೩	೪	೫	೬	೭	೮	೯
Malayalam	൦	൧	൨	൩	൪	൫	൬	൭	൮	൯
Burmese	၀	၁	၂	၃	၄	၅	၆	၇	၈	၉
Khmer	០	១	២	៣	៤	៥	៦	៧	៨	៩
Thai	๐	๑	๒	๓	๔	๕	๖	๗	๘	๙
Lao	໐	໑	໒	໓	໔	໕	໖	໗	໘	໙
Balinese	᭐	᭑	᭒	᭓	᭔	᭕	᭖	᭗	᭘	᭙
Santali	᱐	᱑	᱒	᱓	᱔	᱕	᱖	᱗	᱘	᱙
Javanese	꧐	꧑	꧒	꧓	꧔	꧕	꧖	꧗	꧘	꧙

Linguistics

Formal grammar / Formal systems – In his treatise Astadhyayi, Panini gives formal production rules and definitions to describe the formal grammar of Sanskrit.^[204] In formal language theory, a grammar (when the context is not given, often called a formal grammar for clarity) is a set of production rules for strings in a formal language. The rules describe how to form strings from the language's alphabet that are valid according to the language's syntax. A grammar does not describe the meaning of the strings or what can be done with them in whatever context—only their form. The Backus-Naur form, used to describe the syntax of programming languages, applies similar concepts.^[205]

Mining

Diamond mining and diamond tools: Diamonds were first recognised and mined in central India,^[206] ^[207] where significant alluvial deposits of the stone could then be found along the rivers Penner, Krishna and Godavari. It is unclear when diamonds were first mined in India, although estimated to be at least 5,000 years ago.^[208] India remained the world's only source of diamonds until the discovery of diamonds in Brazil in the 18th century.^[209] ^[210] ^[211] Golconda served as an important centre for diamonds in central India.^[212] Diamonds then were exported to other parts of the world, including Europe.^[212] Early references to diamonds in India come from Sanskrit texts.^[213] The Arthashastra of Kautilya mentions diamond trade in India.^[211] Buddhist works dating from the 4th century BCE mention it as a well-known and precious stone but don't mention the details of diamond cutting. Another Indian description written at the beginning of the 3rd century describes strength, regularity, brilliance, ability to scratch metals, and good refractive properties as the desirable qualities of a diamond.^[214] A Chinese work from the 3rd century BCE mentions: "Foreigners wear it [diamond] in the belief that it can ward off evil influences".^[214] The Chinese, who did not find diamonds in their country, initially used diamonds as a "jade cutting knife" instead of as a jewel.^[214]
Zinc mining and medicinal zinc – Zinc was first smelted from zinc ore in India.^[215] Zinc mines of Zawar, near Udaipur, Rajasthan, were active during early Christian era.^[216] ^[217] There are references of medicinal uses of zinc in the Charaka Samhita (300 BCE).^[218] The Rasaratna Samuccaya which dates back to the Tantric period explains the existence of two types of ores for zinc metal, one of which is ideal for metal extraction while the other is used for medicinal purpose.^[218] ^[219] India was to melt the first derived from a long experience of the old alchemy zinc by the distillation process, an advanced technique. The ancient Persians had also tried to reduce zinc oxide in an open stove, but had failed. Zawar in Tiri valley of Rajasthan is the first known old zinc smelting site in the world. The distillation technique of zinc production dates back to the 12th century CE and is an important contribution of India in the world of science.

Space

- Preliminary concept of gravity – The concept of gravity as attracting objects towards Earth was already known to Greek scholars, Brahmagupta in sixth century CE also described gravity as an attractive force, using the term in which heavier objects attract towards the earth.^[220] ^[221] ^[222]
Periodicity of comets – Indian astronomers by the 6th century CE believed that comets were apparitions that re-appeared periodically. This was the view expressed in the 6th century by the astronomers Varahamihira and Bhadrabahu, and the 10th-century astronomer Bhattotpala listed the names and estimated periods of certain comets, but it is unfortunately not known how these figures were calculated or how accurate they were.^[223]
Tychonic system – A similar model was implicitly mentioned in the Hindu astronomical treatise Tantrasamgraha by Nilakantha Somayaji of the Kerala school of astronomy and mathematics.^[224]
Reduction of the ecliptic: Achyutha Pisharadi discovered the techniques.^[225]

Miscellaneous

Punch (drink) a mixed drink containing fruits or fruit juice that can be both alcoholic and non-alcoholic originated in the Indian subcontinent before making its way into England by passage through the East India Company.^[226] This beverage is very popular among the world with many varietal flavors and brands throughout the beverage industry.
Hookah or water pipe: according to Cyril Elgood (PP.41, 110), the physician Irfan Shaikh, at the court of the Mughal emperor Akbar I (15421605) invented the Hookah or water pipe used most commonly for smoking tobacco.^[227] ^[228] ^[229] ^[230]

Modern India

Medicine

Urea stibamine – Sir Upendranath Brahmachari synthesised urea-stibamine (carbostibamide) in 1922 and determined that it was an effective treatment for kala-azar (visceral leishmaniasis).
post-kala-azar dermal leishmaniasis – n 1922, Brahmachari also discovered a new, deadly form of leishmaniasis. He called it dermal leishmanoid, marked by the appearance of sudden eruptions on the face of the patients without fever or other complaints. He observed it as a disease in partially cured cases of kala-azar, along with those who had no history of the disease at all.^[231] It has since been termed as post-kala-azar dermal leishmaniasis.
Cholera toxin – Cholera toxin was discovered in 1959 by Indian microbiologist Sambhu Nath De.^[232]
In vitro fertilisation – the second successful birth of a 'test tube baby' occurred in India just 67 days after Louise Brown was born. The girl, named Durga, was conceived in vitro using a method developed independently by Subhash Mukhopadhyay, a physician and researcher from Kolkata. Mukhopadhyay had been performing experiments on his own with primitive instruments and a household refrigerator.^[233] However, state authorities prevented him from presenting his work at scientific conferences,^[234] and it was many years before Mukhopadhyay's contribution was acknowledged in works dealing with the subject.^[235]
Cervical cerclage – was first described by V. N. Shirodkar in Bombay in 1955.^[236]

Electronics and communications

Horn antenna or microwave horn, One of the first horn antennas was constructed by Jagadish Chandra Bose in 1897.^[237] ^[238]
Microwave communication – The first public demonstration of microwave transmission was made by Jagadish Chandra Bose, in Calcutta, in 1895, two years before a similar demonstration by Marconi in England, and just a year after Oliver Lodge's commemorative lecture on Radio communication, following Hertz's death. Bose's revolutionary demonstration forms the foundation of the technology used in mobile telephony, radars, satellite communication, radios, television broadcast, WiFi, remote controls and countless other applications.^[239] ^[240]
Low Mobility Large cell (LMLC), is a feature of 5G and is designed to enhance the signal transmission range of a basestation several times, helping service providers cost-effectively expand coverage in rural areas.^[241]
Waveguide – Jagadish Chandra Bose researched millimetre wavelengths using waveguides, and in 1897 described to the Royal Institution in London his research carried out in Kolkata.^[242]

Computers and programming languages

Visual J# – A transitional programming language for programmers of Java and Visual J++ languages, so they could use their existing knowledge and applications on .NET Framework. It was developed by the Hyderabad-based Microsoft India Development Center at HITEC City in India.^[243] ^[244]
Julia is a high-level, dynamic programming language. Its features are well suited for numerical analysis and computational science. Viral B. Shah an Indian computer scientist contributed to the development of the language in Bangalore while also actively involved in the initial design of the Aadhaar project in India using India Stack.^[245]
Kojo – A programming language and integrated development environment (IDE) for computer programming and learning. Kojo is an open-source software. It was created, and is actively developed, by Lalit Pant, a computer programmer and teacher living in Dehradun, India.^[246] ^[247]
RISC-V ISA (microprocessor) implementations (a US standard, not from India, but some implementations are such as those below):
- SHAKTI – Open Source, Bluespec System Verilog definitions, for FinFET implementations of the ISA, have been created at IIT Madras, and are hosted on GitLab.^[248]
- VEGA Microprocessors – India's first indigenous 64-bit, superscalar, out-of-order, multi-core RISC-V Processor design, developed by C-DAC.^[249]
File Transfer Protocol (FTP) – A standard communication protocol used for the transfer of computer files from a server to a client on a computer network. FTP is built on a client–server model architecture using separate control and data connections between the client and the server. Abhay Bhushan is the author of the File Transfer Protocol (which he started working on while he was a student at IIT-Kanpur) and the early versions of email protocols^[250]
TCS BaNCS, was one of the first core banking software started implemented in late 1970's and released in early 80's.

Construction, civil engineering and architecture

Coal Mine to PSP, Coal India will turn abandoned mines or de-coaled mine to Pumped Storage Projects(PSP) with help of NHPC hence saving huge amount of capital for development of reservoir or dams.^[251]
-treated-C&D, researchers at the Centre for Sustainable Technologies (CST), IISc, are exploring ways to store carbon dioxide from industrial flue gas in excavated soil in Construction and Demolition (C&D) waste. the effect of injecting carbon dioxide gas into clayey soil—typically excavated from construction sites. This resulted in better stabilization of clay by cement and lime, and reduced the surface area, pore volume and lime reactivity of clay in soil, thereby improving the bulk engineering performance of the material.^[252] ^[253]
Chenab rail bridge, is the world's first blast proof bridge.^[254]
Rib & spine/Spine & Wing technique, NHAI has developed a flyover design which allows to save cost, time, minimum material usage and allows light under the flyover using the same technique.
(I)-TM Tunneling technique:(I)-TM as Himalayan tunnelling method for tunnelling through the Himalayan geology to build tunnels in Jammu and Kashmir. Engineers decided to provide rigid supports using 'ISHB' as against the lattice girder method used in the New Austrian Tunnelling Method.ISHB uses nine-metre pipes in the mountains. It is called pipe roofing. Engineers made an umbrella using these perforated poles and filled them with PU grout.^[255] ^[256] ^[257]
Plastic road are made entirely of plastic or of composites of plastic with other materials. Plastic roads are different from standard roads in the respect that standard roads are made from asphalt concrete, which consists of mineral aggregates and asphalt. Most plastic roads sequester plastic waste within the asphalt as an aggregate. Plastic roads first developed by Rajagopalan Vasudevan in 2001^[258] ^[259] ^[260]

Finance and banking

Payments bank is an Indian new model of banks conceptualised by the Reserve Bank of India (RBI) without issuing credit.

Paleontology

In 2024, one of the longest snakes to ever exist, Vasuki indicus, was discovered by scientists from the Indian Institute of Technology. The snake was estimated to be between 10.9 and 15.2 metres in length and lived 47 million years ago. The fossilised vertebrae of Vasuki indicus were discovered in a lignite mine in Gujarat. It was likely a slow moving predator who killed its prey through constriction.^[261]
In 2018, scientists from the Geological Survey of India and the Indian Institute of Technology discovered the fossil remains of a previously unknown dinosaur species in the Thar Desert region of Jaisalmer, Rajasthan. The dinosaur is named Tharosaurus indicus, after the Thar Desert and India.^[262]

Genetics

Amrapali mango – A named mango cultivar introduced in 1971 by Dr. Pijush Kanti Majumdar at the Indian Agriculture Research Institute in Delhi.
Mynvax – The world's first "warm" COVID-19 vaccine, developed by IISc, capable of withstanding for a month and neutralise all coronavirus variants of concern.^[263]
ZyCoV-D vaccine – The world's first DNA-based vaccine for humans.^[264]

Metallurgy, manufacturing, and industry

Carbon nitride solar reactor – In September 2021, A team from the Institute of Nano Science and Technology (INST), Mohali, has fabricated a prototype reactor which operates under natural sunlight to produce hydrogen at a scale of around 6.1 litres in eight hours. They have used an earth-abundant chemical called carbon nitrides as a catalyst for the purpose.^[265] ^[266]
High ash coal gasification (coal to methanol) – The central government gave the country world's first 'coal to methanol' (CTM) plant built by the Bharat Heavy Electricals Limited (BHEL). The plant was inaugurated in BHEL's Hyderabad unit, The pilot project is the first that uses the gasification method for converting high-ash coal into methanol. Handling of high ash and heat required to melt this high amount of ash is a challenge in the case of Indian coal, which generally has high ash content. Bharat Heavy Electricals Limited has developed the fluidized bed gasification technology suitable for high ash Indian coals to produce syngas and then convert syngas to methanol with 99% purity.^[267]
Controlled shunt reactor – In 2002, Bharat Heavy Electricals Limited has successfully developed a first-of-its-kind in the world device for improving power transfer capability and reducing transmission losses in the country's highest rating (400 kV) transmission lines.The device is called Controlled Shunt Reactor.^[268] ^[269]
DMR grade steel – For several high-technology applications, such as military hardware and aerospace, need to possess ultrahigh strength (UHS; minimum yield strength of 1380 MPa (200 ksi)) coupled with high fracture toughness in order to meet the requirement of minimum weight while ensuring high reliability.
JD-1 alloy – A special lightweight alloy developed by Jindal Defence with a minimum guaranteed hardness of 500 HB. It can be used in aerospace, small arms, and engineering solutions. It is mainly used in armoured jacket.
Sorption-enhanced steam methane reforming (SESMR) – In April 2022, the scientists from CSIR-Indian Institute of Chemical Technology (CSIR-IICT), Hyderabad developed a fluidized bed reactor (FBR) facility in Hyderabad to perform sorption enhanced steam methane reforming (SESMR) to achieve clean hydrogen in its purest form. The team of scientists have designed a hybrid material to simulate capturing carbon dioxide in-situ (onsite) and converting it into clean hydrogen from non-fuel grade bioethanol.^[270]
Spray-drying buffalo milk – The collective consensus of dairy experts worldwide was that buffalo milk could not be spray-dried due to its high fat content. Harichand Megha Dalaya & his invention of the spray dry equipment, led to the world's first buffalo milk spray-dryer, at Amul Dairy in Gujarat.
Jackal steel – An advanced grade high-strength, low-alloy steel. The technology of Jackal steel has been passed on to Steel Authority of India Limited (SAIL) and MIDHANI for its bulk production.
High-Rise Pantograph – The new-design world record pantograph, developed completely in-house for use in DFC & other freight routes with height of .^[271]
Commercial CCU plant: Tuticorin Alkali Chemicals and Fertilizers Limited (TFL) partnered with Carbon Clean to create the world's first fully commercial CCU plant. The 10 MW facility captures coal-fired boiler flue gas and uses it to deliver industrial quality . The 10 MW facility captures coal-fired boiler flue gas and uses it to deliver industrial quality .^[272] The technology has been developed by Carbon Clean Solutions, headquartered in London – a start-up by two Indian engineers focusing on carbon dioxide separation technology.There are many chemicals exported out of India where is the raw material.^[273]
Triple-stack container freight train^[274] ^[275] – In order to ensure new streams of traffic and commodities and to bring about a modal shift, the DFC is undertaking trials for running smaller than usual containers, known as dwarf containers (where the container height is lower by 660 mm than normal containers), in triple-stack formation to further improve the profitability of train operations. It may be possible to run these as double-stack on conventional routes and triple-stack on routes with high-rise OHE, once the trials are successfully completed.^[276]

Metrology

Crescograph – The crescograph, a device for measuring growth in plants, was invented in the early 20th century by the Bengali scientist Sir Jagadish Chandra Bose.^[277] ^[278]
Shearing interferometer – Invented by M.V.R.K. Murty, a type of Lateral Shearing Interferometer utilises a laser source for measuring refractive index.^[279] ^[280]

Rocket Science

Reusable Launch Vehicle is a two stage to orbit vehicle which will reduce the cost by factor of 10 and as well as world's first rocket with the first stage reusable, first designed in 2012.
Small Satellite Launch Vehicle, is a multi-stage solid propellent rocket, that is cost-effective and very less complex used to deliver micro-satellites less than 500 kg weight. it is innovative as it's 3 stages are solid propellent making it very efficient, cost effective and very less complex.

Science and technology

Bipyrazole Organic Crystals, the piezoelectric molecules developed by IISER scientists recombine following mechanical fracture without any external intervention, autonomously self-healing in milliseconds with crystallographic precision.^[281]
SEBEX 2, is a high performance explosive, it is said to be 2.01 times more lethal than TNT and most powerful non-nuclear explosives in the world.The Indian Navy has certified the explosive.^[282]
Single-crystalline Scandium Nitride, that has the ability to convert infrared light into energy, Scientists based in Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR), Bengaluru have discovered a novel material that can emit, detect, and modulate infrared light with high efficiency making it useful for solar and thermal energy harvesting and for optical communication devices.^[283] ^[284]
Low-threshold gain lasers, researchers from IISER, Bhopal have made a breakthrough in field of low threshold gain lasers using crystals of cesium lead bromide they are able to produce high-intensity lasers with very low energy output.^[285]
Indian Ocean Dipole is an unusual pattern in the ocean-atmosphere system of the equatorial Indian Ocean that influences the monsoon and can offset the adverse impact of El Nino. It is typically characterized by cooler than normal eastern equatorial Indian Ocean and warmer than normal west and unusual equatorial easterly winds. It was discovered in Centre for Atmospheric And Oceanic Sciences, IISc. team led by NH Saji in 1999.^[286]
Iron Ion battery,In 2019 world's 1st iron-ion battery was first invented by team of researchers in IIT Madras.^[287]
Solution combustion synthesis (SCS) was accidentally discovered in 1988 at Indian Institute of Science (IISc), Bengaluru, India. SCS involves an exothermic redox chemical reaction between an oxidizer like metal nitrate and a fuel in an aqueous medium.^[288]
Electrically Excited Synchronous Motor (EESM) or Rare earth free motor: In 2021 deep-tech startup Chara Technologies has built scalable, cloud-controlled electric vehicle motors free of toxic rare-earth metals, thus cutting a massive dependency on imports to accelerate electric mobility in India.^[289] ^[290]

Weapon systems

ATAGS – Bharat Forge and the DRDO has developed world's first electric artillery gun^[291]
Rifle-rated ballistic helmet, MKU has developed what it bills as "a first-of-its-kind rifle-rated ballistic helmet", MKU states that the Kavro Doma 360 is "the first anti-rifle helmet in the world that does not have bolts or any metal parts"^[292]
Critical Situation Response Vehicle (CSRV) – The Central Reserve Police Force (CRPF) has made and inducted a bomb/bulletproof armoured vehicle. The latest all-terrain highly sophisticated vehicle 'CSRV' has given a shot in the arm to the Central Reserve Police Force engaged in counter-terror operations.
E-bomb – The Defence Research and Development Organisation (DRDO) has been developing an e-bomb which will emit electromagnetic shock waves that destroy electronic circuits and communication networks of enemy force.^[293] The tow bodies in Lakshya-2 Weapon Delivery Configuration carry High Energy Weapon Payload.^[294]
Phosphoric Acid Fuel Cell air-independent propulsion (PAFC AIP) is a 270 kilowatt phosphoric acid fuel cell (PAFC) air-independent propulsion (AIP) system to power the Kalvari-class submarines is developed by the Naval Materials Research Laboratory of Indian Defence Research and Development Organisation in collaboration with Larsen & Toubro and Thermax. The patent is owned by DRDO. Its application is considered to be wide and it can also power ships in future.^[295]

Indigenisation and improvements

Helmet AC - Featuring a plastic top and built-in-fan-like structure, the AC helmets are powered by a battery pack, which is worn by the traffic police officials on their waist. These helmets work for around 8 hours on a single full charge.^[296]
CNG car/vehicle – Bajaj Auto launched the first 'commercial' lot of its CNG (Compressed Natural Gas) autorickshaws in Delhi on 29 May 2000.
Digital rupee (e₹) or eINR or e-rupee is a tokenised digital version of the Indian rupee, to be issued by the Reserve Bank of India (RBI) as a central bank digital currency (CBDC). Digital Rupee is using blockchain distributed-ledger technology. Digital rupee users to hit 50,000 by Jan-end on better acceptance.^[297]
MD-15 is a fuel grade in which Methanol is blended with diesel. Research Design and Standards Organisation (RDSO), in collaboration with the Indian Oil Corporation Ltd (IOCL), has developed a special cost-effective fuel that would not only minimize IR's dependency on diesel, but will also be emit fewer pollutants. IOCL developed the composition, adding 14% additives (developed indigenously by IOCL) along with 71% mineral diesel, 15% methanol. MD-15 fuelled engine has shown superior performance, emission and combustion characteristics than the mineral diesel fuelled engine.^[298] ^[299]
Unified Payments Interface – An instant real-time payment system developed by National Payments Corporation of India (NPCI) facilitating person-to-merchant (P2M) transactions through inter-bank peer-to-peer (P2P) mechanism. UPI doesn't need an internet connection for financial transactions, and cardless ATM transactions can also occur using UPI. UPI is not an alternative to a wallet, but more of a solution to the money printing problem.

Mathematics

Sciences

Ammonium nitrite, synthesis in pure form – Prafulla Chandra Roy synthesised NH₄NO₂ in its pure form, and became the first scientist to have done so. Prior to Ray's synthesis of Ammonium nitrite it was thought that the compound undergoes rapid thermal decomposition releasing nitrogen and water in the process.
Ashtekar variables – In theoretical physics, Ashtekar (new) variables, named after Abhay Ashtekar who invented them, represent an unusual way to rewrite the metric on the three-dimensional spatial slices in terms of a SU(2) gauge field and its complementary variable. Ashtekar variables are the key building block of loop quantum gravity.
Bhatnagar-Mathur Magnetic Interference Balance: Invented jointly by Shanti Swarup Bhatnagar and K.N. Mathur in 1928, the so-called 'Bhatnagar-Mathur Magnetic Interference Balance' was a modern instrument used for measuring various magnetic properties. The first appearance of this instrument in Europe was at a Royal Society exhibition in London, where it was later marketed by British firm Messers Adam Hilger and Co, London.^[306]
Bhabha scattering – In 1935, Indian nuclear physicist Homi J. Bhabha published a paper in the Proceedings of the Royal Society, Series A, in which he performed the first calculation to determine the cross section of electron-positron scattering. Electron-positron scattering was later named Bhabha scattering, in honour of his contributions in the field.^[307]
Bose–Einstein statistics, condensate – On 4 June 1924 the Indian physicist Satyendra Nath Bose mailed a short manuscript to Albert Einstein entitled Planck's Law and the Light Quantum Hypothesis seeking Einstein's influence to get it published after it was rejected by the prestigious journal Philosophical Magazine.^[308] The paper introduced what is today called Bose statistics, which showed how it could be used to derive the Planck blackbody spectrum from the assumption that light was made of photons.^[308] ^[309] Einstein, recognizing the importance of the paper translated it into German himself and submitted it on Bose's behalf to the prestigious Zeitschrift für Physik.^[308] ^[309] Einstein later applied Bose's principles on particles with mass and quickly predicted the Bose-Einstein condensate.^[309] ^[310]
Braunstein-Ghosh-Severini Entropy – This modelling of entropy using network theory is used in the analysis of quantum gravity and is named after Sibasish Ghosh and his teammates, Samuel L. Braunstein and Simone Severini.
Dual-phase steel, was publicly first described in "Microstructure and tensile properties of high strength duplex ferrite–martensite (DFM) steels" by P.C. Chakraborti and M.K. Mitra.^[311]
Galena, applied use in electronics of – Bengali scientist Sir Jagadish Chandra Bose effectively used Galena crystals for constructing radio receivers.^[312] The Galena receivers of Bose were used to receive signals consisting of shortwave, white light and ultraviolet light.^[312] In 1904 Bose patented the use of Galena Detector which he called Point Contact Diode using Galena.^[313]
Mahalanobis distance – Introduced in 1936 by the Indian (Bengali) statistician Prasanta Chandra Mahalanobis (29 June 1893 – 28 June 1972), this distance measure, based upon the correlation between variables, is used to identify and analyze differing pattern with respect to one base.^[314]
Mercurous nitrite – The compound mercurous nitrite was discovered in 1896 by the Bengali chemist Prafulla Chandra Roy, who published his findings in the Journal of the Asiatic Society of Bengal.^[315] The discovery contributed as a base for significant future research in the field of chemistry.^[315]
Ramachandran plot, Ramachandran map, and Ramachandran angles: The Ramachandran plot and Ramachandran map were developed by Gopalasamudram Narayana Iyer Ramachandran, who published his results in the Journal of Molecular Biology in 1963. He also developed the Ramachandran angles, which serve as a convenient tool for communication, representation, and various kinds of data analysis.^[316]
Raman effect – The Encyclopædia Britannica (2008) reports: "change in the wavelength of light that occurs when a light beam is deflected by molecules. The phenomenon is named for Sir Chandrasekhara Venkata Raman, who discovered it in 1928. When a beam of light traverses a dust-free, transparent sample of a chemical compound, a small fraction of the light emerges in directions other than that of the incident (incoming) beam. Most of this scattered light is of unchanged wavelength. A small part, however, has wavelengths different from that of the incident light; its presence is a result of the Raman effect."^[317]
Raychaudhuri equation – Discovered by the Bengali physicist Amal Kumar Raychaudhuri in 1954. This was a key ingredient of the Penrose-Hawking singularity theorems of general relativity.^[318]
Periodicity in Nuclear Properties: A sharp pattern is discovered by an Indian researcher regarding the nuclear properties of chemical elements. The remarkable deviations are noticed near the magic numbers.^[319]
Process of formation of the E layer of the ionosphere and night sky luminiscence: Discovered by the Indian physicist, Sisir Kumar Mitra.^[320]

Space

Lunar water – Although the presence of water ice on the Moon has been conjectured by various scientists since the 1960s, inconclusive evidence of free water ice had also been identified. The first incontrovertible evidence of water on the Moon was provided by the payload Chace carried by the Moon Impact Probe released by Chandrayaan-1 in 2009,^[321] ^[322] ^[323] confirmed and established by NASA.^[324]
Saha ionisation equation – The Saha equation, derived by the Bengali scientist Meghnad Saha (6 October 1893 – 16 February 1956) in 1920, conceptualises ionisations in context of stellar atmospheres.^[325]
Quasi-normal modes of black holes – C. V. Vishveshwara discovered the quasi-normal modes of black holes.^[326] These modes of black hole vibrations are one of the main targets of observation using the gravitational wave detector.

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External links

Ancient India's Inventions In Science And Technology
Essays on Indian Science and Technology.
P. K. Ray, SCIENCE, CULTURE AND DEVELOPMENT – A CONNECTED PHENOMENA, Everyman's Science Vol.
History of Science in South Asia (hssa-journal.org). HSSA is a peer-reviewed, open-access, online journal for the history of science in India.

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List of Indian inventions and discoveries explained

Ancient India

Agriculture

Construction, civil engineering and architecture

Finance and banking

Games

Textile and material production

Well-being

Medicine

Equestrianism

Metallurgy, gems and other commodities

Metrology

Weapons

Philosophy and logic

Mathematics

Linguistics

Mining

Space

Miscellaneous

Modern India

Medicine

Electronics and communications

Computers and programming languages

Construction, civil engineering and architecture

Finance and banking

Paleontology

Genetics

Metallurgy, manufacturing, and industry

Metrology

Rocket Science

Science and technology

Weapon systems

Indigenisation and improvements

Mathematics

Sciences

Space

See also

Bibliography

External links

Notes and References