Apostrophe

The speaker addresses someone absent or dead, a thing, a place, or an idea, as if they could hear.

In Macbeth

Stars, hide your fires; / Let not light see my black and deep desires.

Macbeth addresses the "Stars" as if they could hear him and asks them to hide their light. The request shows that he wants to act where no one sees, away from the light.

Act I: The Prophecy and the Temptation, Macbeth, aside

Come, you spirits / That tend on mortal thoughts, unsex me here, / And fill me from the crown to the toe top-full / Of direst cruelty. [...] Come to my woman's breasts / And take my milk for gall, you murd'ring ministers

Act I: The Prophecy and the Temptation, Lady Macbeth

'Gainst nature still! / Thriftless ambition, that will ravin up / Thine own life's means!

Act II: The Murder of Duncan, Ross

I drink to th' general joy o' th' whole table, / And to our dear friend Banquo, whom we miss. [...] Avaunt, and quit my sight! Let the earth hide thee! / Thy bones are marrowless, thy blood is cold; / Thou hast no speculation in those eyes / Which thou dost glare with.

Act III: The King Ruled by Fear, Macbeth

Yet here's a spot. [...] Out, damned spot! Out, I say! One, two. Why, then, 'tis time to do 't. Hell is murky. Fie, my lord, fie, a soldier, and afeard? What need we fear?

Act V: Sleepwalking, Birnam, and the Fall, Lady Macbeth