What is "l1"

init. (context astrophysics English) first Lagrange point, located further in towards the primary of a system where a smaller object orbits a larger one, in front of the smaller object, inline with a line drawn through the centres of the larger and smaller objects n. mother tongue (someone's native language)

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

• L distance in mathematics, used in taxicab geometry
• L, the space of Lebesgue integrable functions in mathematics
• L1, in linguistics, a subject's first language or mother tongue
• 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

• , 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, 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

• 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 DNA (mtDNA) haplogroup from Africa
• Luxo L-1, a lamp
• Panasonic Lumix DMC-L1, a 2006 single-lens reflex camera
• L1A1 Self-Loading Rifle

L1, also known as L1CAM, is a transmembrane protein; it is a neuronal cell adhesion molecule, member of the L1 protein family, of 200-220 kDa, and involved in axon guidance and cell migration with a strong implication in treatment-resistant cancers.

L1CAM has also been designated CD171 ( cluster of differentiation 171).