Radioactive Warning Sign - Universal Symbol for Radiation Hazard #292920 (License: Personal Use)

This is the standard ISO 361 radiation warning symbol: a black trefoil (three-bladed propeller) centered on a yellow equilateral triangle with a thick black border. Designed in 1946 at the University of California, Berkeley, it conveys immediate danger from alpha, beta, gamma, or neutron radiation sources. Its high-contrast color scheme ensures visibility and universal recognition across languages and cultures.

Used on containers, doors, equipment, and signage in nuclear facilities, medical radiology departments, research labs, and transport vehicles carrying radioactive substances. Matches user intent for safety education, regulatory compliance, emergency response training, or hazard identification.