Employee badge
An employee badge was a type of identification card. 

In the late 24th century, personnel working at the Borg Reclamation Project were assigned employee badges. These badges had built-in tracking devices. The employee badge number for Soji Asha was 74983 stroke 2.

After, in 2399, Soji Asha broke out of the Zhal Makh chamber, Narek gave the project security Soji's employee number, informing them she was dangerous, just before they began tracking her. ()
Identification technology