This is the spaced en dash template; it renders like this (without the quote marks): " – "
It works similarly to the HTML markup sequence – i.e. a non-breaking space (which will not line-break and will not collapse together with normal spaces that come before the template), a short dash (known as an en dash), and a normal space (which will line-break and will collapse together with normal spaces that come after the template).
When contemplating using this template, note that the wikicode is incomprehensible to most less seasoned editors{{snd}} they may add a "missing" comma or otherwise copy edit the sentence without regard to the dash or just give up copy editing the paragraph altogether. Don't use it in places where passers-by might want to – or should{{spaced en dash}}contribute.
See also
[edit]- w:Template:Spaced en dash, the version of this template on Wikipedia