In the NFPA hazard sign system, what does "Yellow" signify?

In the NFPA (National Fire Protection Association) hazard sign system, the color yellow specifically signifies reactivity. This system uses a diamond shape with four quadrants that represent different types of hazards: health, flammability, reactivity, and specific hazards. The yellow section of the diamond indicates the potential of a material to react violently with other substances, which could lead to an explosion or release of harmful gases.

Understanding the significance of each color in the NFPA system is crucial for safety, particularly in hazardous environments, as it allows first responders and personnel to quickly assess the risks associated with particular materials. The other colors indicate different hazards: blue represents health risks, red indicates flammability, and white can denote specific hazards or additional safety recommendations, creating a comprehensive approach to hazard identification.