OCS

from Wikipedia:

OCS or Ocs may refer to:

Military

Officer Candidate School or Officer Cadet School, a training establishment in many countries where military officers are trained

Music

Ocean Colour Scene, an English rock groupThee Oh Sees, an American experimental rock bandOmul cu Sobolani, a Romanian alternative rock group

Government

The UK's Office for Civil Society, part of the government's Cabinet OfficeOffice of the Chief Scientist (Australia), a part of Department of Innovation, Industry, Science and Research

Places

Öcs, a village in Veszprém county, HungaryO'Connell Street, a street in Dublin, IrelandOuter Continental Shelf, a maritime federal land zone beyond the jurisdiction of the United StatesOversea Chinese Society, a website that provides useful information for oversea Chinese community.

Psychiatry and medicine

Obsessive-compulsive syndrome or obsessive-compulsive disorder, a psychiatric anxiety disorderOral corticosteroids, medication used for a variety of illnesses, chiefly through the mechanism of suppressing the immune system.

Sports

Outback Champions Series, a series of professional tennis eventsOn course side, a term meaning that a sailboat has crossed the start line of a race early

Science and technology

Carbonyl sulfide, a chemical compound with the formula OCSMicrosoft Office Communications Server, a software productOCS Inventory, an application that enables users to inventory their IT assetsAmiga Original chipset, a Commodore Amiga chipsetOpen Collaboration Services, an open and vendor independent API to access online servicesOnline Charging System, a system allowing communication service providers to charge customers based on service usageOrigin Content Server, another name for a Web Server.

Transportation

Overhead contact system, a system which provides electric power to trains

Schools and alumni associations

Oklahoma Christian SchoolOld Cliftonian Society, the society for the alumni of Clifton College, Bristol, EnglandOpelika City Schools, a school district headquartered in Opelika, Alabama, United StatesOvilla Christian School, a private Christian school located in Ovilla, Texas, United States

Other uses

Old Church Slavonic, a Slavic language developed in the 9th centuryFederation of Old Cornwall Societies or sometimes OCS, a Cornish history charityOphite Cultus Satanas, a satanic cult founded in 1948 by Herbert Arthur Sloane