An ellipsis (…) is used in quotations to indicate an omission of text:
Dr Williams stated, ‘The samples were analysed using a range of methods … no significant differences were found’.
Insert a space each side of the ellipsis if it occurs in the middle of a sentence. If the ellipsis occurs at the end of a sentence, insert a space before it and do not follow it with a full stop.
Word processing tip. The shortcut for an ellipsis in Microsoft Word is Ctrl+Alt+. (on a PC) and Option+; (on a Mac).