L1

L1, L01, L.1, L 1 or L-1 may refer to:

• L₁ distance in mathematics, used in taxicab geometry
• L¹, the space of Lebesgue integrable functions in mathematics
• L1 family, a protein family of cell adhesion molecules
• L-1 Identity Solutions, Inc, a US face-recognition corporation
• L1 (protein), a cell adhesion molecule
• L-1 visa, a document used to enter the United States for the purpose of work
• L₁, Lagrangian point 1, the most intuitive position for an object to be gravitationally stationary relative to two larger objects (such as a satellite with respect to the Earth and Moon).
• L1, one of the frequencies used by GPS systems (see GPS frequencies)
• L1, the common name for the Soviet space effort known formally as Soyuz 7K-L1, designed to launch men from the Earth to circle the Moon without going into lunar orbit.
• L1 - In reference to Magic: the Gathering, an abbreviation denoting someone is a Level 1 Judge.

Containing L1 

• Arado L 1, a 1929 German two-seat parasol-wing sporting monoplane
• ATC code L01 Antineoplastic agents, a subgroup of the Anatomical Therapeutic Chemical Classification System
• DSC-L1, a 2004 Sony Cyber-shot L series camera model
• Haplogroup L1 (mtDNA) A human mitochondrial DNA (mtDNA) haplogroup from Africa.
• Lawrance L-1, a predecessor of the 1920s American Lawrance J-1 aircraft engine
• Luxo L-1, a famous lamp
• Macchi L.1, a 1915 Austrio-Hungarian reconnaissance flying boat
• Panasonic Lumix DMC-L1, a 2006 single-lens reflex camera
• USS L-1 (SS-40), a 1915 United States Navy L-class submarine
• L1 A1, a British self load rifle
• Soyuz 7K-L1, a Soviet space effort to send humans around the moon.

Transportation

• Erie L-1, a 1907 American 0-8-8-0 steam locomotive class
• NCC Class L1, a Northern Counties Committee Irish steam locomotive class
• Soo Line L-1 class, an American 2-8-2 "Mikado" type steam locomotive class
• GNR Class L1, a class of British 0-8-2T steam locomotive
• LNER Thompson Class L1, a class of British 2-6-4T steam locomotive designed by Edward Thompson
• SP&S Class L-1, an 1891 American steam locomotives class
• SR L1 class, was a class of 4-4-0 steam tender locomotives of the Southern Railway (Great Britain)
• Lufthansa Systems' IATA code

And also :

• a L-carrier cable system developed by AT&T
• the Level-1 CPU cache in a computer
• a person's first language
• Ligue 1, the top division of French football
• L=1, a Lunar Eclipse classification on the Danjon scale
• L-1 Vigilant, a designation for the Stinson Aircraft Company's Model 74 Vigilant observation aircraft
• the first Lagrange Point in an astronomical Solar System
• the first lumbar vertebra of the vertebral column in human anatomy
• a class of FM broadcast station in North America