"BIN" is the abbreviation of the English word: BankIdentificationNumber. The Chinese meaning is: bank identification code, a credit card standard BIN number represented by 6 digits, which appears in the first 6 digits of the credit card number. Currently, BIN is A bank card organization designated by the International Organization for Standardization (ISO) to engage in inter-bank transfer exchange.

In these countries, the distribution and use of credit card BINs are as follows: Visa has acquired BINs prefixed with "4", Mastercard has acquired BINs prefixed with "5", and China UnionPay has also applied for The BIN part starting with "6".

The card number refers to the number that identifies the card issuer code (BIN) and cardholder information. It usually includes: the card issuer identification code (BIN), the card issuer’s custom digit, and the verification code.