What symbol is commonly associated with toxic substances on placards?

• A. A lightning bolt
• B. A flame
• C. A skull and crossbones
• D. A biohazard sign

Answer: (C)

The skull and crossbones symbol is widely recognized and specifically designates toxic substances on placards. This symbol serves as a clear warning that the material is hazardous to health, indicating that exposure can result in serious harm or death. It is often used to alert individuals to the presence of chemicals that can cause severe health effects, including poisoning and other life-threatening consequences. The use of this symbol is standardized under various hazardous materials regulations, ensuring consistent communication of risk across different contexts and industries. This symbol plays a crucial role in promoting safety by informing first responders, workers, and the general public about the dangers associated with certain substances.