143 (number) explained

Number:	143
Divisor:	1, 11, 13, 143

143 (one hundred [and] forty-three) is the natural number following 142 and preceding 144. It is one less than a gross.

In media

On Mister Rogers' Neighborhood: "Transformations", 143 is used to mean "I love you". 1 meaning I for 1 letter, 4 meaning Love for the 4 letters, and 3 meaning You for the 3 letters. Reportedly, Fred Rogers maintained his weight at exactly for the last thirty years of his life, and associated the number with the phrase "I love you".^[1]
Jake Shimabukuro released the song "143" based on his experience in high school when 143 was sent on a pager to indicate "I Love You".^[2]
Sal Governale of The Howard Stern Show had a long running saga on the show about his wife who had an emotional friend. He discovered the severity of their relationship when he read their text messages and emails which included "143", shorthand for "I love you".^[3]
"Case 143", song by Stray Kids.
143 is a number frequently used in Omori meaning "I love you"

143. A popular pager number to communicate "I love you" (based on the number of letters in each of the three words)^[4]
143, 2024 album by Katy Perry

143 is also:

The year AD 143 or 143 BC
143 AH is a year in the Islamic calendar that corresponds to 760 – 761 CE
143 Adria is a large main belt asteroid
143 Records label of producer David Foster, a sub-label of Atlantic Records
Psalm 143
Sonnet 143 by William Shakespeare
The 143, in South Africa, refers to the 143 conscientious objectors who publicly refused to do military service in the Apartheid army in 1988.^[5]
The atomic number of unquadtrium, a temporary chemical element^[6]

Hattikutur, Mangkesh. "15 reasons Mr. Rogers was best neighbor ever." http://www.cnn.com/2008/LIVING/wayoflife/07/28/mf.mrrogers.neighbor/ Mental Floss/CNN. 28 Jul 2008.
Web site: Peace Love Ukelele. 19 May 2015. jakeshimabukuro.com. 8 April 2018. https://web.archive.org/web/20180301104127/https://www.jakeshimabukuro.com/home/release/peace-love-ukelele/. 2018-03-01. dead.
Web site: MarksFriggin.com - Stern Show News - Archive. 2020-07-31. www.marksfriggin.com.
Web site: 143.
Nan Cross: Supported men resisting apartheid conscription Sunday Times (South Africa), 2007-07-22, accessed 2009-01-05.
Web site: FLW Incorporated | Specialists in Physical Measurement, Testing, Calibration & Control.