What symbol is used to warn first responders of a fire hazard that presents a risk of mass detonation?

The symbol that indicates a fire hazard associated with the risk of mass detonation is represented by the number "1." This classification is crucial for first responders dealing with potential explosive materials, as it signifies a severe hazard level.

In the context of explosives, the number "1" is part of a labeling system that communicates specific dangers. It denotes materials that pose an extreme risk, indicating that if these materials are ignited, they could lead to a mass detonation. Understanding this symbol allows first responders to take necessary precautions and implement appropriate safety measures to mitigate the risk during emergency situations involving explosives.

Therefore, the number associated with a mass detonation hazard is significant in maintaining safety protocols, ensuring that responders are adequately prepared to address such dangerous scenarios.