Radioactive Symbol - International Ionizing Radiation Warning Sign #228678 (License: Personal Use)

This black-and-white trefoil symbol-three blades arranged at 120-degree angles around a central circle-is the standard warning sign for ionizing radiation hazards. Designed in 1946 at the University of California, Berkeley, it conveys danger without language barriers and is mandated by the IAEA and OSHA in regulated environments. It appears on containers, doors, equipment, and signage where radioactive sources are stored or used.

Used on safety signage, packaging, lab equipment, and nuclear facility entrances to alert personnel and the public to radiation risks; matches user intent for hazard identification, safety training, or regulatory compliance information.