Final answer:
The Skull and Crossbones pictogram is used to indicate fatal or toxic acute toxicity. It's one of the hazard symbols essential for chemical safety. The NFPA 704 system provides a hazard diamond for quick reference to different risks associated with chemicals.
Step-by-step explanation:
The pictogram that indicates fatal or toxic acute toxicity is the Skull and Crossbones. This symbol is internationally recognized and commonly used to represent substances that can cause death or serious toxicity if inhaled, swallowed, or absorbed through the skin. It is one of several hazard symbols used to categorize and communicate chemical risks.
The NFPA 704 Hazard Identification System uses a diamond-shaped symbol to convey important safety information. The blue diamond represents health hazards, whereas the top red diamond is for fire hazards, the yellow diamond for reactivity, and the white diamond for specific hazards like oxidizers or water reactions.
It is important to be aware of these symbols for safety in environments where chemicals are handled. The hazard diamond provides a quick reference to understand the inherent risks of chemicals, aiding in the prevention of accidents and ensuring proper handling and storage.