Which hazard rating system utilizes a diamond shape to indicate various risks?

The hazard rating system that employs a diamond shape to signify different levels of risk is the National Fire Protection Association (NFPA) system. This system utilizes a color-coded diamond with four quadrants, each representing a different type of hazard: health, flammability, reactivity, and specific hazards. The numbers within each quadrant range from 0 to 4, with 0 indicating no hazard and 4 indicating the highest level of risk. This visual representation allows quick identification of the potential dangers associated with materials, which is essential for ensuring safety protocols are effectively communicated and implemented.

In contrast, the Hazardous Materials Information System (HMIS) uses a bar system for rating hazards related to health, flammability, physical hazards, and personal protection, but it does not feature a diamond shape. The Material Safety Data Sheet (MSDS), now commonly referred to as Safety Data Sheets (SDS), provides detailed information on chemicals but is not a hazard rating system in itself. The Occupational Safety and Health Administration (OSHA) establishes regulations for workplace safety but does not have a specific hazard rating system like the NFPA. Therefore, the NFPA diamond system is uniquely identifiable and widely recognized for its effective communication of hazards.