unit of issue
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unit of issue[′yü·nət əv ′ish·ü]
In reference to special storage, the quantity of an item, such as each number, dozen, gallon, pair, pound, ream, set, or yard.
The standard or basic quantity in which an item of supply is issued.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.