Which symbol would indicate a toxic or fatal chemical hazard?

The Skull and Crossbones pictogram is used to indicate the presence of toxic or fatal chemical hazards. This symbol clearly communicates a serious danger associated with exposure to the chemical, emphasizing that it can cause severe health effects or even death. It is part of the Globally Harmonized System (GHS) of Classification and Labeling of Chemicals, which is designed to provide consistent labeling and hazard communication practices across different countries and industries.

In contrast, the other symbols represent different hazards. For example, the Environment pictogram signifies environmental dangers, such as hazards to aquatic life, and is not related to personal toxicity. The Flame pictogram indicates flammability, representing materials that can ignite and burn easily, while the Exclamation mark pictogram denotes less severe hazards, such as skin irritation or narcotic effects. Each symbol serves a specific purpose, and the Skull and Crossbones is uniquely suited to represent toxic or fatal hazards.