• Not to be used to separate parentheses. Apparently used like this:

    * in date ranges, such as 1849–1863,
    * to join two names in a phrase, such as the Michelson–Morley experiment,
    * in multi-part prefixes, such as "post–World War II", although for those, either a hyphen or an en dash can be used; British publications use hyphens, and American publications use en dashes.

    https://en.wikipedia.org/wiki/Wikipedia:Hyphens_and_dashes

    I've never seen the point of those. For me, the En dash isn't sufficiently distinct from a shorter hyphen.

  • All this in an article which places spaces either side of the Em dashes ... :)

    I think Em dashes are typographically much preferable. No spaces, please.

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