Radiation Hazard Symbol - Universal Warning Sign for Ionizing Radiation #3254614 (License: Personal Use)

This image shows the standard ISO 361 radiation hazard symbol: a bright yellow equilateral triangle with a black trefoil (three-bladed propeller) centered around a circle, set against a black background for maximum contrast and visibility. Designed in 1946 at the University of California, Berkeley, it has since become the globally recognized sign for ionizing radiation sources, used in nuclear facilities, medical imaging, and transport of radioactive substances. Its high-contrast design ensures rapid recognition even under poor lighting or from a distance.

Used on signage, equipment labels, packaging, and safety manuals where radioactive materials are present; matches user intent for hazard awareness, regulatory compliance, safety training, or educational content about nuclear physics and radiation protection.