Radiation Hazard Symbol - Official Trefoil Warning Sign #2216226 (License: Personal Use)

This image displays the standard ISO radiation hazard symbol, commonly known as the trefoil, featuring three red blades arranged symmetrically around a central circle on a yellow background, all set against black for maximum contrast. The design was created in 1946 at the University of California, Berkeley, and has since become the universal sign for ionizing radiation sources. It is mandated by regulatory bodies worldwide for labeling radioactive materials, equipment, and controlled areas.

Used on signage, packaging, lab equipment, and emergency response materials to warn of radiation risks; matches user intent for safety compliance, educational content, or regulatory reference.