Radioactive Symbol - Universal Warning Sign for Ionizing Radiation Hazards #281453 (License: Personal Use)

This is the international standard radiation hazard symbol, known as the trefoil, adopted by the IAEA and used globally to mark radioactive materials, equipment, or areas. Designed in 1946 at the University of California, Berkeley, its three-blade design represents radiation emitted from an atom’s nucleus in alpha, beta, and gamma forms. The stark black-on-white contrast ensures high visibility and immediate recognition for safety compliance.

Used on signage, packaging, lab equipment, and nuclear facilities to alert personnel and the public to radiation risks; matches user intent for safety education, regulatory compliance, or scientific illustration.