dog tag

noun
1.
a small disk or strip attached to a dog's harness or collar stating owner, home, etc.
3.
Informal.
a.
any tag for a suitcase, camera, or other personal possession with the owner's name or address.
b.
a tag or card with a person's name or affiliation, worn at conventions, large meetings, etc.

Origin:
1915–20

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
dog tag
 
n
slang (US) a military personal-identification disc

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
Issuance of original license includes validation for one year and dog tag.
Found at the same burial site were his dog tag, rations, as well as spent and unspent ammunition.
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