Skull and crossbones

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A skull and crossbones is a symbol consisting of a human skull and two long bones crossed together under or behind the skull.^[1] The design originated in the Late Middle Ages as a symbol of death and especially as a memento mori on tombstones.

In modern contexts, it is generally used as a hazard symbol, usually in regard to poisonous substances, such as deadly chemicals.^[1]

It is also associated with piracy and software piracy, due to its historical use in some Jolly Roger flags.