SL

SL may refer to:

Arts and entertainment

• Second Life, a multi-user 3D virtual world
• Sensei's Library, an internet website and wiki dedicated to the ancient game of Go

Business and organizations

Politics

• Sendero Luminoso, or "Shining Path", a Maoist guerrilla movement
• Stronnictwo Ludowe, a defunct Polish party

Transportation and vehicle

• SL Corporation, a Korean auto parts company
• Rio Sul Serviços Aéreos Regionais (IATA code SL), a Brazilian airline
• Salt Lake City Southern Railroad (reporting mark SL)
• Stor-Oslo Lokaltrafikk, a public transport operator in Akershus, Norway
• Storstockholms Lokaltrafik, a public transport operator in Stockholm, Sweden
• Thai Lion Air (IATA airline code SL)

Other uses in business

• Sociedad de Responsabilidad Limitada, the Spanish variant of a limited liability company (LLC)

Geography

• SL postcode area of the United Kingdom
• Saint Lucia, a Caribbean island
• Sierra Leone, in West Africa
• Sri Lanka, in South Asia

Language

• Sl (digraph), a Latin-script digraph
• Sign language, used by deaf persons
• Slovene language (ISO 639-1 code "sl")

Science, technology, and mathematics

Biology

• Sensu lato, a term used in taxonomy to mean "in the wider sense" of a definition
• Sophrolaelia, an orchid genus

Computing

• sl, a humorous command in some Unix-based systems that draws a steam locomotive, intended to be invoked as a typo of ls
• .sl, the country code top-level domain for Sierra Leone
• SL (complexity), a class of computational complexity
• Scientific Linux, a Linux distribution
• Service Loading, a variant of WAP push method

Mathematics

• SL (complexity), a class of computational complexity
• Sine lemniscate function
• Special linear group, a term used in mathematics, denoted SL_n
• Sturm-Liouville theory, a theory of a particular class of differential equations
• Subjective logic, a type of probabilistic logic

Vehicles

• Mercedes-Benz SL-Class, an automobile
• Steam locomotive

Other uses in science and technology

• Sonoluminescence, the emission of short bursts of light from imploding bubbles in a liquid when excited by sound

Other uses

• Sine loco, used in bibliographies to indicate that the place of publication of a document is unknown
• Serjeant-at-law, an obsolete legal position in the United Kingdom
• Sharia law, a Muslim legal system
• Standard length, a common measurement for fish