The "Skull and Crossbones" symbol is widely recognized as a warning sign for poison. It typically features a human skull above two crossed bones, indicating that a substance is toxic and can be harmful or fatal if ingested, inhaled, or absorbed through the skin. This symbol is often found on labels of hazardous materials, including certain chemicals and household products. The use of the Skull and Crossbones dates back to the 18th century and has become a universal symbol for danger. It serves to alert individuals to exercise caution and avoid contact with substances that may pose serious health risks, such as pesticides, cleaning agents, and industrial chemicals.