Ellipsis (plural ellipses; from the Ancient Greek: ἔλλειψις, élleipsis, "omission" or "falling short") is a series of dots that usually indicate an intentional omission of a word, sentence or whole section from the original text being quoted. An ellipsis can also be used to indicate an unfinished thought or, at the end of a sentence, a trailing off into silence (aposiopesis), 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 or longing. The ellipsis calls for a slight pause in speech or any form of text, and can be used to suggest a tense or awkward momentary silence.
The most common form of an ellipsis is a row of three periods or full stops (. . .) or a pre-composed triple-dot glyph (…). The usage of the em dash (—) can overlap the usage of the ellipsis. The Chicago Manual of Style recommends that an ellipsis be formed by typing three periods, each with a space on both sides.
The triple-dot punctuation mark is also called a suspension point, points of ellipsis, periods of ellipsis, or colloquially, dot-dot-dot.
Read more about Ellipsis: In Writing, In Mathematical Notation, Computer Interfaces and Programming, On The Internet and In Text Messaging, Computer Representations, Unicode