Radiation Hazard Symbol - Universal Warning Sign for Ionizing Radiation #3802694 (License: Personal Use)

This standardized symbol, known as the trefoil, consists of a black radiating pattern inside a yellow equilateral triangle on a black background. Adopted internationally by the IAEA and ISO, it signals the presence of radioactive materials or ionizing radiation sources requiring caution. Its high-contrast design ensures visibility and immediate recognition in hazardous environments.

Used on containers, doors, equipment, and signage in nuclear facilities, medical imaging departments, labs, and transport vehicles carrying radioactive substances. Matches user intent for safety education, regulatory compliance, emergency response, or hazard identification.