C0 or C00 has several uses including:
- C0, the IATA code for Centralwings airline
- C0 and C1 control codes
- a CPU power state in the Advanced Configuration and Power Interface
- an alternate name for crt0, a library used in the startup of a C program
- in mathematics:
- the differentiability class C<sup>0</sup>
- a C<sub>0</sub>-semigroup, a strongly continuous one-parameter semigroup
- c<sub>0</sub>, the Banach space of real sequences that converge to zero
- a C<sub>0</sub> field is an algebraically closed field
- in physics, c<sub>0</sub>, the speed of light in vacuum
- %C0, the URL-encoded version of the character "ÃÂ"
- C0, a note-octave in music
- an ISO 216 paper format size
- C00, the ICD-10 code for oral cancer
- could refer to:
- An abbreviation for Celsius degrees
- In chemistry, the standard state for solute concentration
See also