Radiation Hazard Symbol - Meaning, History, and Safety Significance #3750622 (License: Personal Use)

This image shows the internationally recognized radiation hazard symbol (trefoil), adopted in 1946 at the University of California, Berkeley. It consists of a central circle with three black blades spaced at 120 degrees on a yellow background, designed for high visibility and immediate recognition. The symbol is mandated by standards such as ISO 361 and IAEA regulations for labeling radioactive sources, equipment, and areas.

Used on signage, packaging, lab equipment, and nuclear facilities to warn personnel and the public of potential radiation exposure; matches user intent for safety education, regulatory compliance, or emergency preparedness information.