emdash ( — ) only ever used as parentheses, either with or without spaces, according to style and preference, i.e.: Sdgdf sdasfasag — bvbnnbsngn jfdgjdj hfhsf agdfgf — fgagfga fasdfasdf or; Sdgdf sdasfasag—bvbnnbsngn jfdgjdj hfhsf agdfgf—fgagfga fasdfasdf.
endash ( – ) used in ranges, such as "10–20" years. Now sometimes used as parentheses, usually with spaces, i.e. Sdgdf sdasfasag – bvbnnbsngn jfdgjdj hfhsf agdfgf – fgagfga fasdfasdf.
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