Calcium.
Abbreviation for the state of California, US.
1 California
2 Central America
3 certified acupuncturist
4 chartered accountant
5 chief accountant
6 chronological age
7 commercial agent
8 controller of accounts
9 current account
circa
In music, abbreviation for col arco, meaning “with the bow”.
Canada.
Množina: CAs
Stands for certificate authority, a trusted entity that issues digital certificates.
See: certificate authority (CA)