0 abbreviation for Card Verification Code: a number on a credit card or debit card (= a card used for payment), usually three digits (= individual numbers) on the back of the card, that is used to prove that the person making the payment has the card in their possession:
You will find your CVC on the back of your credit/debit card on the right side of the white signature strip.
The CVC is an extra code printed on your debit or credit card.
