U+2622 "☢" Radioactive Sign Unicode Character

U+2622 "☢" Radioactive Sign is a universally recognized hazard symbol designed to indicate the presence of ionizing radiation, which is often associated with radioactive materials, nuclear facilities, and medical or industrial equipment that emit such radiation. Its distinctive design, featuring a central black circle with three black wedges radiating outward on a yellow background, was originally created in 1946 by a team at the University of California, Berkeley, to provide a clear warning for workers and the public. This symbol is widely used in signage, labeling, and digital contexts to communicate potential danger and the need for caution, though it is now officially designated as the ionizing radiation trefoil, not the general radiation symbol, by standards like ISO 361.