Other Uses
- c/o, care of, used to address a letter when the letter must pass through an intermediary
- Central office, in telecommunications and telephony
- Certificate of occupancy, a legal document
- Certificate of origin, used in international trade
- Company (co.), a general business abbreviation
- Corsican language, ISO 639 alpha-1
- co, an English prefix meaning coming together (co-operate, co-curricular activities, co-brother etc.)
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