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Wiktionary
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)

Wikipedia
L1

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
Containing L1:
  • ATC code L01Antineoplastic 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 (protein)

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).