The three digits on the back of the credit card are in the signature column, with a total of seven digits. The first four digits are the last four digits of your card number, and the last three digits are the credit card's card-not-present transaction verification code. As shown below:

According to bank staff, the three digits after the signature field on the back of the credit card are the card-not-present transaction password verification code, which is the verification code used by the cardholder to verify his identity when making card-less purchases. It should be reminded that once the cardholder discloses these three digits, the card amount can easily be stolen!