ID number
An ID number was a number assigned to an individual for their identification.
In 2364, USS Enterprise-D's ship's computer registered Jake Kurland's ID number when the prospective Starfleet Academy cadet entered Enterprise's shuttlebay without authorization. (TNG: "Coming of Age")
In 2370, Miles O'Brien's assigned ID number by the Cardassian prison system was 41302. (DS9: "Tribunal")