vehicle identification number

Short definition from Wiktionary

Noun

1. 1
   A mandatory unique alphanumeric code (usually 17 characters long) assigned to each vehicle produced, stamped into the metal on the dashboard on the left-hand side (viewable through the windshield), and on the engine block and at least one other place somewhere on the body of the vehicle.
2. 2
   Alternative form of vehicle identification number.