Ellipses

An ellipsis (plural ellipses) is the sequence of three dots used to indicate an omission in quoted text. Every typeface has an ellipsis character.

Mac OS ellipsis: OPTION + semicolon
Windows ellipsis: ALT + 0133
HTML ellipsis: …

The ellipsis is frequently approximated by typing three periods in a row, or three periods with spaces in between. Three periods in a row are too close together to make a credible quasi-ellipsis. Periods separated by spaces leave too much space and also create the risk of a line break in the middle.

Use the ellipsis character, not the approximations. Word and WP can be configured to automatically substitute an ellipsis character when you type three periods. This suffices in most circumstances.