Radiation Hazard Symbol - Universal Warning Sign for Ionizing Radiation #1242425 (License: Personal Use)

This high-contrast black-and-white symbol, known as the trefoil, was developed in 1946 at the University of California, Berkeley, to denote the presence of ionizing radiation. Its design ensures immediate recognition across language barriers, making it essential for nuclear facilities, medical imaging labs, and transport containers. The symbol is standardized by ISO 361 and IAEA guidelines for consistent hazard communication.

Used on signage, packaging, lab equipment, and safety documentation to alert personnel and the public to radiation risks; matches user intent for safety compliance, regulatory reference, or educational material on hazardous symbols.