Who can help me see what these symbols are called and what they are used for?

I only know the second one. The second meaning is that General Bai Yi was ordered here. The legend of General Bai Yi is a god who cleans up filth and evil. Who he refers to is really unclear, but it is definitely not Zhong Kui. The decree means to convey God's instructions. This symbol means that the Oracle has come.

PS: If your symbol is invalid, it must be stamped, otherwise it will be a blank sheet of paper.