Name of 3 dots to indicate a pause in speech
The better phrase to use to refer to the 3 dots being used to indicate a pause in speech is Suspension point, as we can read on Wikipedia:
The triple-dot punctuation mark is also called a suspension point, points of ellipsis, periods of ellipsis, or colloquially, dot-dot-dot.
However, Collins English Dictionaries defines suspension point as follow:
Suspension point - mainly US one of a group of dots, usually three, used in written material to indicate the omission of a word or words. Compare ellipsis (sense 2)*.
So, perhaps, the better phrase may be suspension points (note the 's' at the end).
* Ellipsis - Also called eclipsisomission of parts of a word or sentence printing a sequence of three dots (...) indicating an omission in text.