Radioactive Warning Symbol - Universal Hazard Sign for Ionizing Radiation #1936490 (License: Personal Use)

This image shows the standard ISO 361 radiation warning symbol: a black trefoil (three-bladed propeller) on a yellow background, enclosed in a black circle. Created in 1946 at the University of California, Berkeley, it signifies the presence of ionizing radiation and is used globally on containers, equipment, and facilities handling radioactive substances. Its high-contrast design ensures visibility and immediate recognition even from a distance.

Used on nuclear facilities, medical radiology departments, transport labels for radioactive cargo, safety signage, educational materials, and regulatory documentation. Matches user intent for hazard awareness, safety compliance, or academic reference about radiation symbols.