fingerprint

Short definition from Wiktionary

Noun

1. 1
   The natural pattern of ridges on the tips of human fingers, unique to each individual.
2. 2
   The patterns left on surfaces where uncovered fingertips have touched, especially as used to identify the person who touched the surface.
3. 3
   A unique combination of features that serves as an identification of something.
4. 4
   A unique identification for a public key in asymmetric cryptography.
5. 5
   A trace that gives evidence of someone's involvement.

Verb

1. 1
   To take somebody's fingerprints.
2. 2
   To identify something uniquely by a combination of measurements.