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identification tag

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noun
  1. either of two oblong metal tags, issued to armed forces personnel, on which are impressed the serial number, name, etc., of the person to whom it is issued, and carried on or about the person at all times.
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Origin of identification tag

First recorded in 1915–20
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018