Hazard signs are visual aids used to warn people of potential hazards and to provide information on how to avoid them. They are commonly used in workplaces, public areas, and other settings where hazards may be present. Hazard signs come in various shapes and colors, with each shape and color representing a different type of hazard. For example, a red octagon with the word "STOP" in white letters is a hazard sign used to warn people of an immediate danger, while a yellow triangle with a black exclamation mark is used to indicate a general hazard or warning.

Common hazard signs include those indicating flammable materials, hazardous chemicals, electrical hazards, radiation, and biohazards. The use of hazard signs helps to prevent accidents and injuries by making people aware of potential dangers and providing guidance on how to avoid them. It is important to follow hazard signs and safety protocols to ensure the safety of oneself and others in the vicinity.