The prohibition sign is meant to prohibit or deter certain actions of people.

The geometry of the forbidden flag is a ring with a slash, where the ring is connected with the slash, in red;

China's provisions of the prohibition of a total of 28 signs, including electricity-related such as: ban flammable materials, prohibit smoking, prohibit passage, prohibit fireworks, prohibit the use of water, fire, prohibit the start of the repair, prohibit the rotation, running when the prohibition of refueling, prohibit the crossing, prohibit riding, prohibit climbing.