Final answer:
The GHS pictogram represents the hazard categories of a chemical substance using a diamond symbol with different sides indicating fire, health, reactivity, and special hazards.
Step-by-step explanation:
The hazard diamond depicted by the GHS pictogram represents the specific hazard category associated with a chemical substance. The diamond is a standardized symbol used to communicate the potential hazards of a substance based on its flammability, health effects, reactivity, and special hazards. Each side of the diamond corresponds to a different hazard category, with the top (red) diamond indicating fire hazard, the left (blue) diamond representing health hazard, the right (yellow) diamond representing reactivity hazard, and the bottom (white) diamond identifying special hazards such as corrosivity, radioactivity, or biological hazards.