http://en.wikipedia.org/wiki/Ellipsis

An ellipsis (denoted as ...) usually indicates an intentional omission of a word, sentence, or whole section from a text without altering its original meaning. Depending on their context and placement in a sentence, ellipses can also indicate an unfinished thought, a slight pause, and nervous or awkward silence.

Aposiopesis is the use of an ellipsis to trail off into silence. For example: "But I thought he was..."

When placed at the beginning or end of a sentence, the ellipsis can also inspire a feeling of melancholy, longing, or a delay before speaking.

For tagging purposes, this may be tagged for series of three or more periods.
It could be also added with Alt+0133.

Ellipsis forms

• emphatic_ellipsis (...!)
• interrobang_ellipsis (...?!)
• questioning_ellipsis (...?)
• trailing_ellipsis - Unused. This term should be easier to remember than aposiopesis.
• vertical_ellipsis

Related tags

• interrupted_speech