Apostrophe

Is an exclamatory rhetorical figure of speech, when a speaker or writer breaks off and directs speech to an imaginary person or abstract quality or idea. In dramatic works and poetry written in or translated into English, such a figure of speech is often introduced by the exclamation "O".

*"Where, O death, thy sting? where, O death, thy victory?" 1 Corinthians 15:55, (Saint) Paul of Tarsus
*"O, pardon me, thou bleeding piece of earth, / That I am meek and gentle with these butchers! / Thou art the ruins of the noblest man / That ever lived in the tide of times." Shakespeare, Julius Caesar, Act 3, Scene 1
*"Is this a dagger which I see before me, The handle toward my hand? Come, let me clutch thee! I have thee not, and yet I see thee still." Shakespeare, Macbeth, Act 2, Scene 1