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An apostrophe is a rhetorical device consisting of speech directed in an abstract direction (as "O Death, where is thy sting?"), to a person not present, or to a thing (as "Thou still unravish'd bride of quietness" in "Ode on a Grecian Urn").
It is usually introduced by the word "O" (not the exclamation "oh").
See also apostrophe (mark).