Three dots.
More from Punctuation.
The quickest way is to copy … from this page and paste it anywhere. You can also insert it with its Unicode, HTML, or alt code listed above.
… is U+2026 (decimal 8230).
Use … in HTML to render … on a web page.
On Windows you can type it with Alt+8230 (hold Alt and enter the number on the numeric keypad).
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