Elipses, is the term for that.  Fun fact I just learned, each period is supposed to have a space on either side.  So . . .  instead of ...

[quote]Informal writing
 
In informal writing, an ellipsis can be used to represent a trailing off of thought.
 
[i]If only she had . . . Oh, it doesn’t matter now.[/i]
 
An ellipsis can also indicate hesitation, though in this case the punctuation is more accurately described as suspension points.
 
[i]I wasn’t really . . . well, what I mean . . . see, the thing is . . . I didn’t mean it.[/i]
 
Like the exclamation point, the ellipsis is at risk of overuse.
[/quote]

Anyway, lemme get reading that/those post(s).