Radiation Warning Symbol - Meaning, History, and Safety Guidelines #1806371 (License: Personal Use)

This image displays the internationally recognized radiation warning symbol (ISO 361), featuring a black trefoil on a yellow circular background with a central black circle. Designed in 1946 at the University of California, Berkeley, it conveys immediate danger from ionizing radiation and is standardized by ISO and IAEA for consistent hazard communication. The high-contrast colors ensure visibility and recognition across languages and contexts.

Used on signage, packaging, equipment, and facilities handling radioactive substances; appears in nuclear energy, medical imaging, industrial radiography, and emergency response contexts. Matches user intent for safety education, regulatory compliance, or hazard identification research.