L (disambiguation)

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L, or l, is the twelfth letter of the English alphabet.

L or l may also refer to:

Units of measurement and currency

L, Langmuir (unit), a unit of exposure to a surface
L, length in general (often the longest dimension, as opposed to width, height, or depth)
- Horse length, used in horse racing
- Boat length, used in rowing
L, l or ℓ, litre unit
Ancient Roman libra (translated as "pound"), a weight measure with derivative units denoted with "L" or a derived character:
- Pound (currency), a number of currencies from the British Empire, abbreviated £ or (historically) "l", "L", or " ${\mathfrak {L}}$ ". (Some fonts use a two-bar version resembling the lira sign ₤.)
- Livre (disambiguation), a number of currencies from the French Empire, with the original abbreviated "£", "₶", or "lt"
- Lira, a number of currencies from Italy and the Ottoman Empire, abbreviated as ₤
Leaf (books) ("l." or ℓ), an alternate numbering for books, in contrast to "p." for pages
Specification for a line of text, for example "l. 3" is the third line of text

Science

Mathematics

L, constructible universe, a particular class of sets which can be described entirely in terms of simpler sets
L-function
Laplace transform
${\mathcal {L}}$ , likelihood function
ℓ^p space, the space of sequences with a finite p-norm
L^p space, a function space defined using a natural generalization of the p-norm for finite-dimensional vector spaces

Computing

L (complexity), a complexity class in computational complexity theory
L-notation, a notation for running times of subexponential algorithms, often used in number theory
L – A Mathemagical Adventure, a 1984 computer game
Android L, code name for Android Lollipop

Physics

Angular momentum
Inductance, the ratio of the magnetic flux to the current in an electrical circuit
Latent heat
Luminosity
Mean free path, the average distance traveled by a moving particle between successive collisions
Class L, a stellar classification
Galactic longitude (l), in the galactic coordinate system

Chemistry

l, abbreviation for liquid
Avogadro constant, in some German scientific literature
Leucine, an α-amino acid
_L- prefix, a levorotatiory compound
Lewisite, a blister agent

Biology

Carl Linnaeus, in botanist author citations (L.)
Haplogroup L (Y-DNA)
Vertebra in the lumbar region of the spinal cord
ATC code L Antineoplastic and immunomodulating agents, a section of the Anatomical Therapeutic Chemical Classification System

Music

L (French singer), French singer-songwriter
L (South Korean singer), vocalist of Korean boy band Infinite
L Marshall, British singer credited as L on the Wretch 32 song "Traktor"
Lesure Number, music catalogue identifier for the compositions of Claude Debussy
L Number, classification of the compositions of Franz Benda according to the catalogue of Douglas A. Lee

Albums

Vehicles and transportation

L (Los Angeles Railway)
Chicago "L", a rapid transit system in Chicago
L (New York City Subway service)
L Line (Los Angeles Metro)
Market-Frankford Line, currently branding to L.
Transilien Line L, a line of the Paris transport network
The official West Japan Railway Company service symbol for:
- Maizuru Line.
- Uno Line.
L-plate, a plate for learning drivers under instruction
L Taraval (San Francisco Muni)
Nissan L engine
L, the low gear of an automatic transmission
LB&SCR L class, a British tank locomotive on the London, Brighton, and South Coast Railway

Companies and organisations

L. Inc., California-based corporation that makes organic personal care products
Liberals (Sweden), a political party in Sweden
Loews Corporation, by NYSE ticker symbol
Miscellaneous, when used as the fifth letter or behind-the-dot notation on the NASDAQ and NYSE ticker symbols

Language and literature

50 (number), in Roman numerals
[ʟ], the velar lateral approximant (IPA notation)
[l], the alveolar lateral approximant (IPA notation)
The Cyrillic palochka (ӏ)
The "low" or common language in a diglossia
${\mathfrak {L}}$ , a siglum for the Vetus Latina version of the Bible
L (novel), a 1999 novel by Erlend Loe
L (Death Note), a character from the Death Note manga series

Places

L postcode area, for Liverpool
L Island, former name for Scawfell Island, Queensland, Australia
L, the military time zone code for UTC+11:00

Other uses

Lucius (praenomen), a Roman praenomen
Left (direction)
L, a rating of the Brazilian advisory rating system
L (film), a 2012 Greek film
Lucifer (2019 Indian film), abbreviated simply as L
L, production code for the 1965 Doctor Who serial The Rescue
Canon L lens
Latina Televisión, a Peruvian television channel
Internet slang for losing