Two common uses are...
Carbon Copy - When relating to a letter, sometimes a copy of a letter needs to be sent to more than one person, or kept by an organisation. The letter would have something like 'cc Personnel file' after the sender's signature.
Credfit card - cc is used in banking as the short form of credit card.
E-banking is an abbreviation for electronic banking.
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CC means Carbon Copy
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(IOD) - Intimation of Disapproval (CC) - Commencement Certificate .
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From Email? :Carbon Copy