L2

L2, L², L02, L II, L.2 or L-2 may be :

In 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 (aka EUMEL/ELAN), a persistent microkernel operating system developed by German computer scientist Jochen Liedtke
ISO/IEC 8859-2 (Latin-2), an 8-bit character encoding

L2 point, the second Lagrangian point in an astronomical Solar System
L2 Puppis, a star which is also known as HD 56096
L2, The Advanced Telescope for High Energy Astrophysics is a proposed X-ray telescope. It is the second (L2) large class mission within ESA Cosmic Vision Program.

LZ 18 (L 2), a German Zeppelin sometimes referred to by its Navy designation of L 2
Arado L II, a 1929 German two-seat, high-wing sporting monoplane
ASJA L2, a 1932 Swedish biplane trainer aircraft
Junkers L2, an aircraft engine whose development lead to the Junkers L5
Lawson L-2, a 1920 American biplane airliner
Macchi L.2, an Italian biplane flying boat
L-2 Grasshopper, a Taylorcraft aircraft used by the United States Army Air Forces in World War II
PZL Ł.2, a 1929 Polish liaison aircraft

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
Metropolitan Railway K Class, a 1925 class of 2-6-4Ts that became LNER class L2

The space L² space of square-integrable functions, in mathematics
L² norm, in mathematics
The space ℓ² of square-summable sequences, in mathematics
L² cohomology, a cohomology theory for smooth non-compact manifolds M with Riemannian metric

L2 (music group), an American pop duo
Second language (L2), the language acquired as a second one, after the mother tongue
L², the official youth wing of Flemish Progressives, a Flemish political party
L-2 visa, a document used to enter the United States by the dependent spouse and minor unmarried children of qualified L-1 visa holders
ATC code L02 Endocrine therapy, a subgroup of the Anatomical Therapeutic Chemical Classification System
Haplogroup L2 (mtDNA) in human genetics
a class of FM radio broadcasting in North America
a frequency used in GPS satellite navigation signals, see GPS signals, a newer version is the L2C frequency
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
Ligue 2, a league in French football (soccer)
Lineage II, a MMO game
Lumines II, a puzzle game
Leprechaun 2, 1994 film
Lynden Air Cargo IATA code
The L designation given to the Sterling submachine gun in the British armed forces
The second lumbar vertebrae of the vertebral column, in human anatomy
Walker County Airport (former FAA LID: L02)
L2, a variety of low-alloy special purpose steel
L2, the second lumbar vertebra in human anatomy