Radiation Hazard Symbol - Meaning, Usage, and Safety Information #3829624 (License: Personal Use)

This iconic orange trefoil symbol, consisting of three blades surrounding a central circle, was developed in 1946 at the University of California, Berkeley, to warn of ionizing radiation hazards. It is standardized by ISO 361 and used globally on containers, equipment, and signage where radioactive substances or radiation-emitting devices are present. The high-contrast orange color ensures visibility and immediate recognition under diverse lighting conditions.

Commonly used in nuclear facilities, medical imaging departments, laboratories, transport packaging, and emergency response materials; matches user intent for safety education, regulatory compliance, or hazard identification.