Radiation Hazard Symbol - Meaning, History, and Safety Use #131590 (License: Personal Use)

This standardized radiation hazard symbol, known as the trefoil, features three black blades arranged at 120-degree angles around a central circle on a bright yellow field. Adopted internationally since 1946, it signifies the presence of radioactive materials or ionizing radiation sources requiring caution and protective measures. Its high-contrast design ensures visibility and immediate recognition in emergency, industrial, and healthcare settings.

Used on signage, packaging, equipment, and safety manuals to warn personnel and the public about radiation hazards; matches user intent for safety education, regulatory compliance, or hazard identification resources.