Final answer:
The NFPA 704 Hazard Identification System diamond is the type of hazard label that displays the type of hazard, United Nations hazard class, and a specific identifying number. It categorizes hazards such as flammability, reactivity, health, and special hazards.
Step-by-step explanation:
The type of hazard label that displays the type of hazard, the United Nations hazard class, and a specific identifying number is called the National Fire Protection Agency (NFPA) 704 Hazard Identification System diamond. This diamond symbol provides safety information about certain substances and categorizes hazards such as flammability, reactivity, health, and special hazards.
Within the NFPA diamond, the top (red) diamond represents the level of fire hazard, the blue (left) diamond indicates the level of health hazard, and the yellow (right) diamond describes reactivity hazards. The white (bottom) diamond points out special hazards like oxidizers, corrosives, or radioactive substances. Each hazard is rated on a scale from 0 to 4, with 0 being no hazard and 4 being extremely hazardous.