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A skull and crossbones is a symbol consisting of a human skull and two long bones crossed together under the skull.〔http://www.merriam-webster.com/dictionary/skull%20and%20crossbones〕 The design originates 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 warning of danger, usually in regard to poisonous substances, such as deadly chemicals.〔http://www.merriam-webster.com/dictionary/skull%20and%20crossbones〕 Unicode uses 〔(【引用サイトリンク】title=Skull and Crossbones Emoji )〕 for the symbol. ==History of the symbol== The symbol originates with the medieval ''Danse Macabre'' symbolism. By the 15th century, the symbol had developed into its familiar form. It is used in military flags or insignia, expressing the recklessness or ferocity of the unit displaying it, since at least the 15th century and becomes associated with piracy in particular in the 18th. It came to be used specifically to mark the entrances of Spanish cemeteries. The use of the symbol to mark poison dates to the 19th century. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Skull and crossbones (symbol)」の詳細全文を読む スポンサード リンク
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