personal identification number
From Longman Dictionary of Contemporary EnglishRelated topics: Bankingpersonal identification numberˌpersonal identifiˈcation ˌnumber noun [countable] BFBa pinExamples from the Corpuspersonal identification number• To defend against loss or theft, the cards usually require the user to enter a personal identification number as well.• Users will be required to enroll in the service and obtain a personal identification number.