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An identification code assigned to a specific financial assistance award by an agency for tracking purposes. The FAIN is tied to that award (and all future modifications to that award) throughout the award's life. Within an agency, FAINs are unique; a new award must be issued a new FAIN. FAIN stands for Federal Award Identification Number, though the digits may be both letters and numbers.

The Federal Award Identification Number (FAIN) is the unique ID within the Federal agency for each financial assistance award.