CO

CO, Co, co, .co, c/o may refer to:

• Co, the chemical symbol for the element cobalt
• Co., an abbreviation for Company
• Co., an abbreviation for County
• Carbon monoxide, the molecular formula of the toxic gas (also called carbonic oxide)
• C.O., post-nominal initials to identify members of the congregation of the Oratory of Saint Philip Neri
• .co, the Internet top-level domain for Colombia
• .co (second level), Internet second-level domain used to denote commercial organizations in many countries
• CO postcode area for Colchester, England
• Cardiac output, the volume of blood being pumped by the heart per time unit
• Central office, in telecommunications and telephony
• Certificate of occupancy, a legal document
• Certificate of origin, used in international trade
• Champions Online, an MMO Action/RPG game developed by Cryptic Studios
• Check out, a Revision Control System command
• Chemins de fer Orientaux - an Ottoman railway company.
• Chesapeake and Ohio Railway
• Chinese Orchestra
• Coccygeal nerve of the spinal cord
• Colombia, in various country codes
• Colonial Office, a former UK government department
• Colorado (United States postal abbreviation)
• Command (disambiguation)
• Commitment ordering or Commit ordering, a concurrency control (serializability) technique for databases and transactional systems
• Como, Lombardia, Italy
• Company (co.), a general business abbreviation
• Compliance officer, a title used by the Food and Drug Administration for agents charged with enforcing its policies
• Computer organization
• Conjure One, Canadian music artist
• Conquer Online, a MMORPG PC game
• Conscientious objector, military
• Continental Airlines, IATA airline designator
• Corsican language, according to ISO 639 alpha-1
• Cuboctahedron

People and official titles

• Certified Orthotist
• Chief Officer
• Commanding officer, military
• Commissioned officer, military
• Communications Officer in Central Communications Command
• Conservation officer
• Contracting Officer
• Corrections Officer (or Correctional Officer)

Other

• "care of", used to address a letter when the letter must pass through an intermediary
• "complaining of", the Chief complaint in the medical record of a presenting patient
• "co", a prefix meaning coming together (co-operate, co-curricular activities, co-brother etc.)
• "c/o", an acronym used in MMORPGs, stands for: Current Offer
• "c/o", an acronym used in a medical history, stands for: "complaining of"

See also

• C0 (disambiguation) - the letter-number combination