Radioactive Warning Sign - Universal Symbol for Radiation Hazard #95065 (License: Personal Use)

This internationally recognized radiation warning symbol, known as the trefoil, consists of three black blades arranged radially around a central circle on a bright yellow background, enclosed in a black-bordered equilateral triangle. Designed in 1946 at the University of California, Berkeley, it conveys immediate danger from ionizing radiation sources such as nuclear materials, X-ray equipment, or contaminated zones. Its high-contrast design ensures visibility and rapid recognition even from a distance or under poor lighting.

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