What hazard word is represented by a skull and crossbones symbol?

The presence of the skull and crossbones symbol is universally recognized as an indication of a poison hazard. This symbol is specifically used to signify that a substance is poisonous and can cause serious injury or death if ingested, inhaled, or absorbed. It communicates a clear and immediate danger associated with the chemical, emphasizing the necessity for precautions when handling such materials to prevent exposure and ensure safety.

The other terms—while related to hazards—carry different meanings. "Toxic" generally refers to substances that can cause harm or injury but does not necessarily invoke the immediate lethality implied by the skull and crossbones. "Hazardous" is a broader term that could encompass various levels of risk and different types of hazards, not exclusively poison. "Warning" suggests a cautionary message but lacks the specific connotation of lethality that the skull and crossbones represents. Thus, "poison" is the term most directly associated with the hazards indicated by this particular symbol.