What is the symbol written in yellow on red paper?

The talisman written in yellow on the red paper is the talisman to ward off evil spirits and suppress evil spirits. In Feng Shui, yellow represents earth, red represents fire, and red characters on a yellow background represent Buddha, which can represent the Buddha sitting in the house. The formal talismans are drawn by Taoist priests. Those drawn on red paper are spell-casting talismans, and those on yellow paper are sutra and incantation talismans. The yellow paper talisman is a special talisman to ward off evil spirits and suppress demons, because yellow represents the sun and is lethal to demons. This answer is for reference only, please do not be blindly superstitious.