What hazard is indicated by the corresponding hazard symbol?

The hazard symbol indicating "May cause permanent injury or death" is typically represented by a skull and crossbones. This symbol signifies that the substance is extremely hazardous and can lead to severe health consequences upon exposure, such as injuries that might not be reversible, or fatality.

When encountering such a symbol, it’s essential for laboratory professionals to understand the potential risks associated with the substance. This includes taking necessary precautions such as using appropriate personal protective equipment (PPE), ensuring proper ventilation, and following specific handling and disposal protocols to mitigate the serious risks associated with exposure.

The other options describe different hazards, but they pertain to other symbols. For instance, symbols indicating toxic vapours or reactivity with water represent different levels and types of dangers and require distinct safety measures. Understanding these distinctions is crucial for maintaining a safe laboratory environment and responding appropriately to potential chemical hazards.