L1, L01, L.1, L 1 or L-1 may refer to:
Mathematics, science and technology
Math
L1 distance in mathematics, used in taxicab geometry L1, the space of Lebesgue integrable functions ℓ1, the space of absolutely convergent sequences Lasso (statistics), a means of regression analysis used in statistics and machine learning
Science
L1 family, a protein family of cell adhesion molecules L1 (protein), a cell adhesion molecule L1 or LINE1; transposable elements in the DNA , 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) Anthranilic acid, also called vitamin L1 The first lumbar vertebra of the vertebral column in human anatomy The first larval stage in the Caenorhabditis elegans worm development
Technology
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 ISO/IEC 8859-1 (Latin-1), an 8-bit character encoding An L-carrier cable system developed by AT&T The level-1 CPU cache in a computer Sony Xperia L1, an Android smartphone A class of FM broadcast station in North America
Transportation and military Lehrgeschwader 1, from its historic Geschwaderkennung code with the Luftwaffe in World War II Lufthansa Systems' IATA code Lawrance L-1, a predecessor of the 1920s American Lawrance J-1 aircraft engine L1 Dulwich Hill Line on the Inner West Light Rail, a light rail service in Sydney, Australia L1 (New York City bus), a temporary bus route in New York City Volkswagen L1, a Volkswagen concept hybrid car L1A1 Self-Loading Rifle L1, an S-Bahn line of the Léman Express in Switzerland and France G:link (numbered L1), a light rail line on the Gold Coast, Australia
Locomotives Erie L-1, an American 0-8-8-0 steam locomotive class GCR Class 1B, latterly known as LNER Class L1, a class of British 2-6-4T steam locomotives GNR Class L1, latterly known as LNER Class R1, a class of British 0-8-2T steam locomotives LNER Thompson Class L1, a class of British 2-6-4T steam locomotives NCC Class L1, a Northern Counties Committee 0-6-0 class steam locomotive Pennsylvania Railroad class L1s, an American 2-8-2 steam locomotive class Soo Line L-1 class, an American 2-8-2 steam locomotive class SP&S Class L-1, an American 4-4-0 steam locomotive class SR L1 class, a class of 4-4-0 steam locomotives of Great Britain VR Class Vr1 (originally L1), a Finnish steam locomotive class
Aircraft Arado L 1, a 1929 German two-seat parasol-wing sporting monoplane Macchi L.1, a 1915 Austro-Hungarian reconnaissance flying boat Stinson L-1 Vigilant, the US Army Air Forces designation for the Stinson Model 74 observation aircraft
Submarines USS L-1 (SS-40), a 1915 United States Navy L-class submarine HMS L1, a Royal Navy submarine
Other Ligue 1, the top division of French football Lowest unique bid L1, in linguistics, a subject's first language or mother tongue L-1 Identity Solutions, a US face-recognition corporation L-1 visa, a document used to enter the United States for the purpose of work L1, an abbreviation denoting someone is a Level 1 Judge, in reference to Magic: The Gathering Bose L1 Portable Systems L=1, a lunar eclipse classification on the Danjon scale L1, the postcode for central Liverpool, a major UK city L1 or Lucifer (2019 Indian film), a 2019 Indian political action thriller film, followed by L2: Empuraan L1 (broadcaster), the public broadcaster for the Dutch province Limburg
Containing L1
ATC code L01 Antineoplastic agents, a subgroup of the Anatomical Therapeutic Chemical Classification System Barcelona Metro line 1 DSC-L1, a 2004 Sony Cyber-shot L series camera model Haplogroup L1 (mtDNA), a human mitochondrial haplogroup from Africa Luxo L-1, a lamp Panasonic Lumix DMC-L1, a 2006 single-lens reflex camera
See also Level 1 (disambiguation) 1L (disambiguation)