Unique identifier.
Unique identifier. Unique identifier means the numbers, letters, or combination of numbers and letters that identify merchandise admitted to a zone with zone status.
Source
19 CFR § 146.1
Scoping language
The following words, defined in section 1 of the Foreign-Trade Zones Act of 1934, as amended (19 U.S.C. 81a), are given the same meaning when used in this part, unless otherwise stated: Board, Grantee, and Zones.