CO, Co, co, .co, c/o is an abbreviation that can stand for:
- CO postcode area for Colchester, England
- Captain Olimar, character in the Pikmin video game series
- Carbon monoxide, the molecular formula of the toxic gas (also called carbonic oxide)
- 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
- Certified Orthotist
- Chesapeake and Ohio Railway
- Chief Officer
- Chinese Orchestra
- Colombia, in various country codes
- Colorado (United States postal abbreviations)
- Command
- Commanding officer, military
- Commissioned Officer, military
- Communications Officer in Central Communications Command
- Como, Lombardia, Italy
- 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
- Contracting Officer
- Corrections Officer (or Correctional Officer), a prison guard
- Co, the chemical symbol for the element cobalt
- Company (law) (Co.), a general business abbreviation
- Coccygeal nerve of the spinal cord
- Corsican language, according to ISO 639 alpha-1
- CO, meaning "check out", a Revision Control System command
- 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, or a second-level domain within country code domains of countries that employ a two-level postfix before the registrable domain name, e.g.
.co.uk, .co.jp.
c/o or ℅
- "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
See also
- C0 - the letter-number combination
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