What does C in Shashi No.5 Middle School mean?

It means the high school part of Shashi No.5 Middle School. According to official website of Shashi No.5 Middle School. Part C of Shashi No.5 Middle School, in which Part C refers to the logo of a specific class or teaching organization in high school. Usually, schools will divide high schools into different classes or teaching organizations for management and teaching arrangements. Shashi No.5 Middle School in Jingzhou City, Hubei Province, hereinafter referred to as Shashi No.5 Middle School, is a key construction school in Jingzhou City, with excellent teaching quality and a key demonstration high school in Jingzhou City.