What do three dots mean at the end of a sentence?

Three dots at the end of a sentence, also known as an ellipsis, can have a few different meanings:

* Incomplete thought: This is the most common usage. The ellipsis indicates that the sentence is unfinished, either intentionally or because it's a direct quote.

* Trailing off: The speaker or writer may be trailing off in thought, suggesting hesitation, uncertainty, or a change of subject.

* Pause for effect: The ellipsis can be used to create a dramatic pause, building suspense or emphasizing a particular word or phrase.

Examples:

* "I'm not sure... what to say." (Incomplete thought)

* "She looked at him, her eyes wide... and then she ran." (Trailing off)

* "The door creaked open... and then silence." (Pause for effect)

Note: Ellipses should be used sparingly. Too many ellipses can make your writing seem weak or unclear.