Radioactive Warning Symbol - Universal Ionizing Radiation Hazard Sign #228685 (License: Personal Use)

This image shows the standard radiation warning symbol (trefoil), adopted by the IAEA and ISO, consisting of a black circle with three yellow 60-degree sectors spaced at 120-degree intervals around a central yellow circle. It was developed in 1946 at the University of California, Berkeley, and is mandated on containers, equipment, and areas where radioactive materials are present. The high-contrast color scheme ensures visibility and universal comprehension across language barriers.

Used on nuclear facilities, medical imaging labs, radioactive waste containers, and safety signage; matches user intent for educational, regulatory, or safety compliance content about radiation hazards.