The document discusses the National Fire Protection Association (NFPA) 704 hazard rating system. It has three color-coded sections (blue, red, yellow) that correspond to health, fire, and instability hazards. Each section rates the hazard level from 0-4, with 4 being the highest risk. The white section indicates special hazards. The system provides standardized signage and hazard information for emergency personnel responding to hazardous materials incidents.