Radioactive Symbol | International Ionizing Radiation Warning Sign #3796658 (License: Personal Use)

This is the standard ISO 361 radiation hazard symbol: a black trefoil (three-bladed propeller) centered within a circle, set against a white background. Designed in 1946 at the University of California, Berkeley, it visually conveys the invisible danger of ionizing radiation through high-contrast geometry. It appears on containers, doors, equipment, and signage in nuclear facilities, medical imaging labs, and transport vehicles.

Used in safety signage, educational materials, regulatory documentation, and emergency response guides to alert personnel and the public to radiation risks; matches user intent for hazard identification, safety training, or technical reference.