Radiation Hazard Symbol - Universal Warning Sign for Ionizing Radiation #3796642 (License: Personal Use)

This black-and-white trefoil symbol, known as the radiation hazard symbol or trefoil, consists of three equidistant black blades radiating from a central circle, enclosed within a circle. Designed in 1946 at the University of California, Berkeley, it was standardized by ISO and IAEA for universal recognition in nuclear facilities, medical imaging, and transport of radioactive substances. Its high-contrast design ensures visibility and immediate comprehension across language barriers.

Used on signage in nuclear power plants, radiology departments, laboratories, and transport containers to alert personnel and the public to potential ionizing radiation exposure. Matches user intent for safety education, regulatory compliance, emergency preparedness, and scientific communication.