fingerprint

The natural pattern of ridges on the tips of human fingers, unique to each individual.

The patterns left on surfaces where uncovered fingertips have touched, especially as used to identify the person who touched the surface.

Unique identification for public key in asymmetric cryptosystem.

A unique combination of features that serves as an identification of something.

A trace that gives evidence of someone's involvement.

To take somebody's fingerprints.

“The jail staff fingerprints its inmates routinely”

To identify something uniquely by a combination of measurements.