Additionally:
* Use the minus sign /−/ (U+2212) when formatting numbers, because the default hyphen-minus /-/ (U+2D) just looks wrong: "It is −1 °C vs. -1 °C." Moreover, the correct minus has the same width as plus (− vs. +).
* Rare, but use the figure dash /‒/ (U+2012) or figure space / / (U+2007) if you need a placeholder character that is the same width as a single digit. For example, "Guess the PIN: 1‒34."