What shape does the NFPA hazardous rating symbol resemble?

The NFPA hazardous rating symbol is designed as a diamond shape, which provides a clear and recognizable way to communicate information about the hazards associated with a substance. The diamond is divided into four quadrants, each representing a different type of hazard: health risks, flammability, reactivity, and specific hazards. The use of a diamond shape allows for a compact display that is easily interpretable at a glance, assisting both professional handlers and emergency responders in understanding immediate hazards.

Other shapes, such as triangles, circles, or squares, do not adhere to the standardized format set by the National Fire Protection Association (NFPA) for communicating hazard information. Thus, they do not provide the specific clarity and information that the diamond shape effectively conveys in the context of safety and emergency preparedness.