What does OS stand for?

MLA style: "OS." Acronym Finder . 2012. AcronymFinder.com 2 Jun. 2012 http://www.acronymfinder.com/Ogawa-Shigeo-(Engines)-(OS).html
Chicago style: Acronym Finder . S.v. "OS." Retrieved June 2 2012 from http://www.acronymfinder.com/Ogawa-Shigeo-(Engines)-(OS).html
APA style: OS. (n.d.) Acronym Finder. (2012). Retrieved June 2 2012 from http://www.acronymfinder.com/Ogawa-Shigeo-(Engines)-(OS).html

Ogawa Shigeo (Engines)

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Off Screen (cinematography) Off Stage Offensive Support Office of Security Office of Sustainability Office of Systems Office of the Secretary Office Superintendent Office Support Officer's Statement (performance evaluation)		Oh Shoot (polite form) Ohr Somayach (school) Oil Separator Old Saxon Old School Old Silcoatian (Silcoates School, Wakefield, UK) Old Spice (after shave brand) Old Stuff :-) Old Style Old Style (or Old System; referring to Julian Calendars)