Where is the license plate 'Shaanxi S' from?

[RemingtonAnn]

Shaanxi S is the license plate of the Shaanxi Military District. 'Shaan' represents Shaanxi Province, and the letter following 'Shaan' represents cities within Shaanxi Province. The license plate codes for other cities in Shaanxi Province are: Shaan B - Tongchuan City, Shaan C - Baoji City, Shaan D - Xianyang City, Shaan E - Weinan City, Shaan F - Hanzhong City, Shaan G - Ankang City, Shaan H - Shangluo City, Shaan J - Yan'an City, Shaan K - Yulin City, Shaan V - Yangling Agricultural Demonstration Zone. License plates are plates hung on the front and rear of vehicles, made of materials such as aluminum, sheet iron, plastic, or paper. License plates refer to vehicle registration plates, and their functions are: 1. To identify the region to which the vehicle belongs; 2. To trace the owner of the vehicle and its registration information based on the license plate.