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

Mathematics, science, and technology[edit]

Biology and medicine[edit]


  • Cobalt (chemical symbol Co)
  • Carbon monoxide, the molecular formula of the toxic gas (also called Carbonous oxide)

Electronics and computing[edit]

  • .co (second-level domain), Internet second-level domain used to denote commercial organizations in many countries
  • Commitment ordering or Commit ordering, a concurrency control (serializability) technique for databases and transactional systems

Other uses in mathematics, science, and technology[edit]


Ranks and titles[edit]


Other uses[edit]

See also[edit]