Vehicle registration plate

A vehicle registration plate, also known as a number plate (British, Indian, Pakistani, Australian, and New Zealand English), license plate (American English) or licence plate (Canadian English), is a metal or plastic plate attached to a motor vehicle or trailer for official identification purposes. All countries require registration plates for commercial road vehicles such as cars, trucks, and motorcycles, for hire.

Source: Wikipedia — Vehicle registration plate (CC BY-SA 4.0)