Is it the number 0 or the letter o on the license plate?

[EliFitz]

It is the number 0 on the license plate, not the letter o. This is because the letters o and i resemble the Arabic numerals 0 and 1, which are already used in license plates. To avoid confusion between the letters i, o and the numbers 0, 1, and to facilitate the sorting of license plate numbers, the vehicle management office prohibits the use of the letters i and o in license plate regulations. Other letters and numbers are allowed. A license plate number is a legal mark registered by statutory authorities, permitting a motor vehicle to drive on the road, and serves as an identifier for the vehicle's identity, displayed at specific locations on the vehicle. A license plate number consists of three parts: the first part is a Chinese character representing the abbreviation of the province where the vehicle is registered; the second part is an English letter representing the code of the city where the vehicle is located; and the third part is a five-digit serial number.