The frame number is VIN (Vehicle Identification Number), and its Chinese name is Vehicle Identification Number, which is a set of characters assigned to a car by the manufacturer for identification. The VIN code is a code consisting of 17 letters and numbers, also known as 17 identification code, frame number or 17 number. After arranging and combining the vehicle identification codes, the vehicles of the same model will not be repeated within 30 years, which is unique to vehicles, so it can be called "automobile identification card".