SL

SL may refer to:__NOTOC__

Computing

*SL (complexity), a class of computational complexity
*.sl, the country code top-level domain for Sierra Leone
*Second Life, a massively multi-user 3D virtual world
*Scientific Linux, a Linux distribution

Transport

*Mercedes-Benz SL, an automobile
*Rio Sul Serviços Aéreos Regionais, IATA code SL, a Brazilian airline
*Salt Lake City Southern Railroad's reporting mark
*Stor-Oslo Lokaltrafikk, public transport operator in Akershus, Norway
*Storstockholms Lokaltrafik, public transport operator in Stockholm, Sweden

Organisations

*Sendero Luminoso, the "Shining Path" Maoist guerrilla movement
*SL Corporation, a Korean auto parts company
*Stronnictwo Ludowe, a defunct Polish party

Other uses

*Sl, the abbreviation for the orchid genus "Sophrolaelia"
*sl, Slovene language ISO 639-1 code
*s.l., sine loco, used in bibliographies to indicate that the place of publication of a document is unknown
*s.l., sensu lato, used in taxonomy to mean "in the wider sense" of a definition
*SL_n, Special linear group in mathematics
*sl, special linear Lie algebra in mathematics
*Serjeant-at-law, an obsolete legal position in the United Kingdom
*Standard Level, a level of course difficulty in the International Baccalaureate Diploma Programme
*Seditious Libeler, the initials SL were branded onto the faces of certain Protestants by Archbishop William Laud