The Workplace Hazardous Materials Information System Class and Division Hazard Symbols would use skull with crossbones within a circle to indicate corrosive or dangerously reactive materials.

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The skull with crossbones within a circle is used to indicate toxic or poisonous substances. The hazard symbol used to indicate corrosive or dangerously reactive materials is a diamond with a black border and a white interior, with the symbol for the specific hazard in the center.