CO

Look up co, -co, c/o, care of, or co- in Wiktionary, the free dictionary.

CO or variants may refer to:

People

Nguyễn Hữu Có (1925–2012), a Vietnamese general

Places

CO postcode area, or Colchester postcode area, England
Colombia, in various country codes
Colorado (United States postal abbreviation)

Ranks and titles

Commanding officer, the officer in command of a military unit
Contracting Officer (CO or KO), in the U.S. government
C.O., post-nominal initials of members of the congregation of the Oratory of Saint Philip Neri

Science, technology and mathematics

Biology and medicine

Cardiac output (CO), the volume of blood being pumped by the heart per time unit

Chemistry

Cobalt, a chemical element, symbol Co
Carbon monoxide (CO), a colorless, odorless, and tasteless gas
Carbonyl group, composed of a carbon atom double-bonded to an oxygen atom: C=O

Electronics and computing

.co, the Internet top-level domain for Colombia
.co (second-level domain), Internet second-level domain meaning "commercial"
Commitment ordering (CO), a concurrency control technique for databases

Mathematics

co (function prefix), a prefix for complementary functions in mathematics

Transport

Chemins de fer Orientaux (CO), a former Ottoman railway company
Chesapeake and Ohio Railway (C&O or CO), a former American railroad
Continental Airlines (IATA airline designator CO), an American airline before 2012
Cobalt Air (IATA airline designator CO), a Cypriot airline from 2016

Other uses

Certificate of occupancy (CO), a legal document
Certificate of origin (often abbreviated to C/O or CoO), in international trade
Company (abbreviated co.)
Corsican language, ISO 639-1 language code co
Counties of Ireland, abbreviated Co.
co-, an English prefix meaning coming together
Telephone exchange, or Central office (CO)

See also

C0 (disambiguation), the letter-number combination
Care of (disambiguation)
Co-Co locomotives

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