Radioactive Warning Symbol - Meaning, History, and Safety Significance #228573 (License: Personal Use)

This image shows the standard ionizing radiation warning symbol, known as the trefoil, featuring three black blades arranged at 120-degree angles around a central circle, set against alternating yellow and black segments. Originally designed in 1946 at the University of California, Berkeley, it has since become the universal sign for radiation hazards under ISO 361 and IAEA standards. The symbol is used on containers, doors, signage, and equipment to alert personnel and the public to potential exposure risks.

This image is commonly used on safety training pages, nuclear regulatory websites, emergency response guides, and educational content about radiation protection. It matches user intent for understanding hazard symbols, complying with OSHA/IAEA guidelines, or identifying radioactive risk zones.