It is forbidden to push the door by hand. The sign is that

The sign prohibiting pushing the door by hand is a graphic sign. According to the public information about the inquiry, there will be a red circle on the sign, and the black pattern in the center of the circle indicates that some behavior is prohibited. Specifically, in the center of this black pattern, there are usually two hands, the palm of which faces the center of the sign and the hands are pushed outward, indicating that it is forbidden to push the door or knock on the door by hand. The purpose of this sign is to warn people to use correct sliding doors in public places to avoid unnecessary security risks.