International Bank Account Number, an international standard for identifying bank accounts across national borders
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Bank card number, the primary account number found on credit cards and bank cards
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National identification number, a number used by the governments of many countries as a means of tracking people for the purposes of work, taxation, government benefits, health care, and other governmentally-related functions
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An issue number is a supplementary number to the account number of certain debit cards, primarily United Kingdom ones such as Switch and Maestro.