The white license plate number at the beginning of sd is the vehicle of shenyang military area command Equipment Department. White license plates are common in public security departments, judicial departments, procuratorates, armed police forces and PLA troops. Generally speaking, the letter A stands for the court, the letter B stands for the procuratorate, the letter C stands for the Ministry of National Security, and the letter D stands for the court. The license plate color of domestic cars is: 1, and blue: most cars using this license plate are cars or small-tonnage trucks, which is a common car license plate; 2. Yellow: Most cars with yellow license plates are large trucks, trailers and other models, and some family cars over six meters should also be labeled with yellow cards; 3. Black: Most cars with black license plates belong to consulates, and Guangdong Z license plates issued by Guangdong are also black license plates; 4. Green license plate: cars with green license plates are new energy vehicles, small new energy vehicles have gradient green license plates, and large new energy vehicles have yellow and green colors.