What is this symbol on the Taoist symbol?

This symbol on the Taoist symbol is that when painting Taoist symbols, three tick marks appear on the Fu Tou, which is the symbol of Sanqing, and an imperial edict appears. Each pen drawn on both sides has seven circles, representing the protection of the Big Dipper, and the five circles are the protection of the five emperors, namely, the five emperors of gold, wood, water, fire and earth. For example, the old man is in a hurry to exorcise evil spirits, and both sides of the law should be painted with the meaning of protector. Changmiao lay man