Meaning of dog tag

dog' tag"

Pronunciation: [key]
  1. a small disk or strip attached to a dog's harness or collar stating owner, home, etc.
  2. See
    1. any tag for a suitcase, camera, or other personal possession with the owner's name or address.
    2. a tag or card with a person's name or affiliation, worn at conventions, large meetings, etc.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.