(1) (Card Security Code) A three- or four-digit number printed on the back of credit cards for security purposes. Called "Card Verification Value" (CVV) by Visa, "Card Validation Code" (CVC) by MasterCard and "Card Identification (CID) by American Express and Discover, the number is requested by merchants to ensure that people actually have the card in their possession. The CSC number is also written into the magnetic stripe.
(2) (Common Short Codes) See short code.
Learn more about CSC