Radiation Hazard Symbol - Universal Warning Sign for Ionizing Radiation #1951664 (License: Personal Use)

This universally recognized radiation hazard symbol, known as the trefoil, consists of a black circular background with three bold yellow扇-shaped blades spaced 120 degrees apart around a central yellow circle. Designed in 1946 at the University of California, Berkeley, it conveys immediate danger from ionizing radiation sources such as radioactive materials, X-ray equipment, or nuclear reactors. Its high-contrast design ensures visibility and rapid recognition across languages and cultures.

Used on signage, packaging, equipment labels, and safety documentation in nuclear power plants, radiology departments, research labs, and hazardous material transport. Matches user intent for safety awareness, regulatory compliance, emergency response, or educational content about radiation risks.