Radioactive Warning Symbol - International Ionizing Radiation Hazard Sign #1207156 (License: Personal Use)

This iconic symbol, known as the trefoil, consists of a yellow equilateral triangle with a black central circle and three black扇-shaped blades spaced at 120 degrees. Designed in 1946 at the University of California, Berkeley, it serves as a universal warning for potential exposure to harmful ionizing radiation. Its high-contrast design ensures visibility and immediate recognition in labs, nuclear facilities, medical imaging centers, and transport packaging.

Used on signage, equipment labels, containers, and safety documentation to warn personnel and the public of radiation risks; aligns with user intent for hazard identification, regulatory compliance, and emergency preparedness.