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.
Origin
1915-20
Examples from the web for identification tag
The identification tag shall be securely attached to the left bow of the boat in plain view and easily recognizable.
The number on the identification tag shall be stamped on the boat permit.
Dogs should wear an owner identification tag at all times.
Dogs and cats should wear a collar or harness, rabies tag, and identification tag at all times.