41 CFR § 101-30.101-4
Federal item identification
June 9, 2020
Federal item identification means the approved item identification for the item of supply, plus the national stock number assigned to that item identification. It consists of four basic elements: The name of the item, the identifying characteristics, the Federal Supply Classification code, and the national item identification number.
[41 FR 11308, Mar. 18, 1976]