dog tag

from WordNet (r) 3.0 (2006)

dog tag
    n 1: military identification tag worn on a chain around the neck
    2: metal plate on a dog collar bearing its registration number

from Moby Thesaurus II by Grady Ward, 1.0

19 Moby Thesaurus words for "dog tag":
      ID card, badge, calligram, calling card, card, countermark,
      countersign, credentials, identification, identification badge,
      identification tag, initials, letter of introduction, monogram,
      press card, serial number, signature, tessera, visiting card