OS

OS, O.S., Os, O's, or os may refer to:

Businesses

• Ordnance Survey, national mapping agency of Great Britain
• Austrian Airlines (IATA code OS based on its original name: Österreichische Luftverkehrs AG)
• O.S. Engines, a Japanese manufacturer of model aircraft engines
• OutSystems, multinational software company which operates in the agile software development market

Entertainment

• "Os" (Fringe), an episode of the television show Fringe
• Outlaw Star, a manga and anime series

Medicine

• Oculus sinister, meaning "left eye" in general ophthalmologic or optometric usage, particularly in eyeglass prescriptions
• Ohtahara syndrome, a brain disorder
• "overall survival", a cancer survival statistic
• ostium, in medicine, a mouth or external opening, in particular:
  • external os, the external orifice of the uterus
  • internal os, the internal orifice of the uterus
  • per os, meaning "ingestion by mouth"
  • os or ostium, the opening of a coronary artery

People

• Alexander Os (born 1980), a Norwegian biathlete
• Os du Randt (born 1972), a South African rugby player
• Os Guinness (born 1941), an English author and social critic

Places

• Os, Hedmark, a municipality in Hedmark county, Norway
• Os, Hordaland, a municipality in Hordaland county, Norway
• Oś, Kluczbork County, a village in Kluczbork County, Opole Voivodeship, Poland
• Os, Värnamo, a village in Värnamo Municipality, Småland province, Sweden
• Os, Østfold, a parish in Rakkestad municipality in Østfold county, Norway
• Os Church, a name for several churches in Norway
• Osiedle (Os.), a Polish term used for housing subdivisions in Poland
• OS, ICAO code for airports in Syria

Religion

• Ōs, an Old English word denoting a god in Anglo-Saxon paganism, related to æsir
• O.S., Order of Santiago, a Spanish order dedicated to St James the Greater
• O.S., Order of Sikatuna, the national order of diplomatic merit of the Philippines

Science and technology

• Ocean Science (journal), an oceanographic journal
• Open source, a software development model
• Operating system, a software that manages the hardware and software of a computer
• Osmium, a chemical element (symbol Os)

Sport

• Os TF, a sports club in Os, Norway
• On-sight climbing, an ascent of a rock climbing route on the first attempt
• Baltimore Orioles, an American baseball team nicknamed "O's"
• Leyton Orient, an English football (soccer) team nicknamed "O's

Titles

• Ordinary Seaman (occupation), an unlicensed member of the deck department of a merchant ship
• Ordnance Sergeant, an enlisted rank in the U.S. and Confederate armies during the American Civil War era
• "Old Stonyhurst", used by alumni of Stonyhurst College

Other uses

• Ōs (rune) (ᚩ), a rune of the Anglo-Saxon fuþorc
• Old Style (O.S.) date, indicating use of the Julian Calendar, as opposed to "N.S." (new style) indicating use of the Gregorian Calendar
• Ossetic language (ISO 639-1 abbreviation OS)
• Object sexuality, sexual attraction to inanimate objects
• Oral sex

See also

• ÖS (disambiguation)
• Oz (disambiguation)