–

The exact midpoint between the hyphen and the em dash, as wide as an N — the en dash. Its trade is the range — dates, pages, scores — and the link between names: the Rio–Niterói bridge, the London–Paris line.

The mistake it corrects is the keyboard hyphen in ranges: 12-20 reads as a compound word; 12–20 reads as “from 12 to 20”. In British typography it also doubles as the sentence dash, with spaces around it – like this.

Wrong:  pages 12-20 · the Rio-Paris flight · 2010-2020
Right:  pages 12–20 · the Rio–Paris flight · 2010–2020