Aposiopesis is Greek for becoming silent and is signalled in English by three dots…
There are three reasons for aposiopesis: you can’t go on; you don’t need to go on; or you want to leave the audience hanging.
But thought’s the slave of life, and life time’s fool;
And time, that takes survey of all the world,
Must have a stop. O, I could prophesy,
But that the earthy and cold hand of death
Lies on my tongue: no, Percy, thou art dust
And food for …
From Henry IV, Part 1, the death of Henry Percy
And From King Lear:
No, you unnatural hags, I will have such revenges on you both,
That all the world shall … I will do such things …
What they are, yet I know not: but they shall be
The terrors of the earth.