The six counties of Wannian, Chang 'an, Henan, Luoyang, Taiyuan and Jinyang are called Jingxian County, and the county magistrate is above five grades. In the Tang dynasty, the fish symbol can only be worn by officials with more than five products. In the Tang Dynasty, officials with more than five grades had a fish symbol indicating their identity, which was filled in a bag and called a "fish bag".

The fish symbol in the Tang Dynasty refers to the fish-shaped symbol in the Tang Dynasty. There are tong yu symbols used to mobilize the army and replace the guards; There is a personal fish symbol used to indicate the identity of an official; There are also fish symbols and fish patrol symbols for entering and leaving the palace gate and opening and closing the palace gate.