L2 Explained

L2, L², L02, L II, L.2 or L-2 may refer to:

Astronomy

L₂ point, second Lagrangian point in a two body orbiting system
L₂ Puppis, star which is also known as HD 56096
Advanced Telescope for High Energy Astrophysics, a proposed X-ray telescope

Biology

Haplogroup L2 (mtDNA) in human genetics
ATC code L02 Endocrine therapy, a subgroup of the Anatomical Therapeutic Chemical Classification System
the second lumbar vertebrae of the vertebral column in human anatomy
the second larval stage in the Caenorhabditis elegans worm development

Computing

L2 cache, the Level-2 CPU cache in a computer
Layer 2 of the OSI model, in computer networking
L2 (operating system), or Liedtke 2 (a.k.a. EUMEL/ELAN), a persistent microkernel operating system developed by German computer scientist Jochen Liedtke
L2 (programming language)
ISO/IEC 8859-2 (Latin-2), an 8-bit character encoding

Entertainment

L2 (music group), an American pop duo
, a 2024 Indian film
Leprechaun 2, a 1994 American film
Lineage II, a 2003 MMO game
Lumines II, a 2006 puzzle game

Mathematics

The L² space of square-integrable functions
L² norm
The ℓ² space of square-summable sequences
L² cohomology, a cohomology theory for smooth non-compact manifolds with Riemannian metric
, the family of 2-dimensional projective special linear groups on finite fields.

Technology and weapons

a variety of low-alloy special purpose steel
a L-carrier cable system developed by AT&T
a series of fragmentation hand grenades used by the British armed forces (American M61 copies), before being replaced by the L109 grenade
the L designation given to the Sterling submachine gun in the British armed forces
a frequency used in GPS satellite navigation signals, see GPS signals, a newer version is the L2C frequency

Transportation

Aircraft

LZ 18 (L 2), a short-lived 1913 German airship (Imperial Navy designation: L 2)
Arado L II, a 1929 German model of high-wing sporting monoplane
ASJA L2, a pair of 1932 Swedish trainer biplanes
Lawson L-2, a 1920 American biplane airliner
Macchi L.2, an Italian model of biplane flying boat
L-2 Grasshopper, an American Taylorcraft model used in WWII
PZL Ł.2, a 1929 Polish model of liaison aircraft

Aviation

Junkers L2, an engine model; precursor to the Junkers L5
Lynden Air Cargo, Alaskan airline (IATA code: L2)
Walker County Airport (or Bevill Field), Alabama, U.S. (former FAA LID: L02)

Rail locomotives

Chesapeake and Ohio Class L-2 and L-2a, an American 4-6-4 "Hudson" type steam locomotives model
Milwaukee Road class L2, an American 2-8-2 "Mikado" type steam locomotive
SP&S Class L-2, an 1881 steam locomotives class
LNER Class L2, a 1925 class of 2-6-4Ts

Other modes of transport

L2 (New York City bus), a temporary bus route in New York City, U.S.
The Randwick branch of the CBD and South East Light Rail in Sydney, Australia, numbered L2

Other uses

Second language (L2), a non-native, acquired tongue of an individual
L², a Flemish political youth organization
L-2 visa, a U.S. travel document for dependents of temporary workers
a class of FM radio broadcasting in North America
Ligue 2, a French association football league
L2 Inc, an American market research company

See also