Radiation Hazard Symbol - Official Ionizing Radiation Warning Sign #292921 (License: Personal Use)

This iconic radiation warning symbol, known as the trefoil, features three black blades arranged at 120-degree angles around a central circle on a bright yellow background. Adopted in 1946 by the United States and later standardized by the IAEA and ISO, it signals the presence of ionizing radiation that may pose health risks. Its high-contrast design ensures visibility and immediate recognition in labs, nuclear facilities, medical imaging centers, and transport containers.

Used on signage, equipment labels, and safety documentation in nuclear energy, healthcare (radiology/oncology), research labs, and hazardous material transport; matches user intent for safety awareness, regulatory compliance, or educational reference.