What is the meaning of ?

Indicates a pause.

Indicates an omission.

Indicates trailing off at the end of a sentence.

A response used to express being at a loss for words, such as due to annoyance, shock, or confusion.

Separates different ideas or messages within the same text message. (In modern usage, multiple messages would be sent instead.)

Indicates that a computer command will request further information, typically by opening a dialog box.

Links loosely related clauses and surrounds parentheticals in the manner of the comma, semicolon or em dash

In algebraic notation: Preceding a move made by Black, unless White's previous move is given on the same line.

May be, or form part of, a leader: a series of dots used as a visual aid to connect items in lists, such as chapter headers to page numbers in a table of contents.

In a sequence of numbers, omits numbers, when the pattern to be followed is clear.

Indicates that an indefinite sequence of digits of an irrational number follows.

See ... for the Morse code letter "S".

See …….

Source: wiktionary.org