When I am writing, and I want to leave something out, so that it gives an implied effect, I use this: ...
What is it called?
(New Oxford American Dictionary)
It is represented in Unicode by the glyph U+2026 HORIZONTAL ELLIPSIS: …
The details of typesetting ellipses is discussed briefly in the Wikipedia article linked above. In short, the decision is on how much space you put between the individual dots. This is a styling issue, which is settled by each publisher. (For example, in French, it is typical not to space them out more than three normal dots.)
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