CO

com. abbr.

Crystal Oscillator

engin. abbr.

Crystal Oscillator

abbr.

Check Out (RCS)

abbr.

Connection Oriented (CL)

comp. abbr.

Central Office

comp. abbr.

Command Output

comp. abbr.

Convert Out

acronym

Cash Order

acronym

Central Office (Telephony)

acronym

Colorado

acronym

Commanding Officer

acronym

Conscientious Objector