Apostrophe:


Definition: A figure of speech that directly addresses an absent or imaginary person personified abstraction, such as liberty or love. The effect may add familiarity or emotional intensity.
Dictionary.com: A digression in the form of an address to someone not present, or to a personified object or idea, as “O Death, where is thy sting?”

Examples:


Antony addresses Caesar's corpse immediately following the assasination in Shakespeare's Julius Caesar:

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

Papa Above!
Regard a Mouse.
-Emily Dickinson

Milton! Thou shouldst be living in this hour;
England hath need of thee . . .
-William Wordsworth


Works Cited