Radiation Hazard Symbol - Meaning, History, and Safety Use #1375823 (License: Personal Use)

This iconic black-on-yellow (or black-on-white in monochrome) trefoil symbol consists of three curved blades radiating from a central circle, representing alpha, beta, and gamma radiation. Designed in 1946 at the University of California, Berkeley, it has since become the globally standardized warning for radioactive materials and ionizing radiation sources. Its high-contrast, geometric simplicity ensures immediate recognition across language barriers.

Used on signage, packaging, equipment, and documentation in nuclear facilities, medical imaging labs, research centers, and transport containers; matches user intent for safety education, regulatory compliance, or hazard identification.