How many categories are safety signs divided into?

Safety signs are divided into four categories: prohibition signs, warning signs, instruction signs and prompt signs.

1. The meaning of prohibition signs is to prohibit people from unsafe behaviors. Its basic form is a circular box with a slash. Circles and slashes are in red, circle symbols are in black. The backing is white. In the same area, the image drawn in the circle appears larger and clearer.

2. The meaning of warning signs is to remind people to pay attention to the surrounding environment to avoid possible dangers. Its basic form is an equilateral triangle border. The triangle border and graphic symbols are black, and the background is yellow. The triangle itself has sharp and intense characteristics, which is easy to attract attention. Clearer than a circle even in poor lighting. The triangle is also used as a geometric figure for warning signs in the draft international standard.

3. The meaning of the instruction mark is to force people to take certain actions or take precautions. A place marked with an "instruction sign" requires people to arrive at this place and must comply with the regulations of the "instruction sign". For example, at a construction site, if there is an instruction sign "Must wear a safety helmet" near the construction site, the safety helmet must be worn, otherwise it will violate the safety regulations of the construction site. Its basic form is a circular border. Graphic symbols are white and the background is blue.

4. The meaning of the reminder sign is to provide people with certain information (such as marking safety facilities or places, etc.). General reminder signs refer to the direction of safety passages and emergency doors. For example, in a dangerous production workshop, when an accident occurs, operators are required to evacuate quickly from the safety passage. This requires a "prompt sign" indicating the direction of the safety passage near the safety passage. Its basic form is a square border. Graphic symbols are white and the background is green. Rectangles have weight and distinctiveness. In addition, prompt signs also need to have enough space to write text and draw arrows to prompt necessary information, so a rectangular shape is appropriate. Sometimes, supplementary signs are added to emphasize a certain sign. Supplementary signs are text marked below each safety sign to supplement the meaning of the safety sign. Supplementary text can be written horizontally or vertically. Supplementary text for general listings is written horizontally. A supplementary sign erected on a pole at a specific location, with text written vertically on the pole.