Radioactive Symbol - International Ionizing Radiation Warning Sign #2188073 (License: Personal Use)

This iconic black-and-white trefoil symbol, adopted in 1946 at the University of California, Berkeley, visually conveys the danger of ionizing radiation. Its three curved blades represent alpha, beta, and gamma radiation types, radiating from a central source. It is standardized by ISO 361 and used globally on containers, equipment, and facilities handling radioactive materials.

Used on nuclear power plants, medical imaging labs, radiation therapy units, and hazardous material packaging; serves to alert personnel and the public to potential radiation exposure risks.