barcode

Short definition from Wiktionary

Noun

1. 1
   Any set of machine-readable parallel bars or concentric circles, varying in width, spacing, or height, encoding information according to a symbology.
2. 2
   A portion of a gene that identifies a particular species.
3. 3
   An instance of self-harm, typically with multiple parallel cuts along a line, similar in form to a machine barcode.