The "☣" emote or "Biohazard Sign" emote is a symbol used to indicate the presence of hazardous materials or substances that pose a danger to human health or the environment. It is often seen in contexts such as warning signs, safety equipment, and hazardous waste disposal. The symbol consists of a black trefoil on a yellow background, with the three arms of the trefoil representing the potential hazards of radiation, chemical, and biological substances.