abbreviation for Card Verification Value: 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

The full credit card number is reprinted in the signature box and at the end of the number is the CVV. 信用卡的完整号码也打印在签名栏里。这个号码的后面是银行卡安全代码。

Sellers are prohibited from retaining CVV numbers for any longer than it takes to verify a given transaction. 商家被禁止在验证某笔交易之后继续保留该银行卡的安全代码。