What most people think of as a hyphen (the key at the top-right of the keyboard) is actually a hyphen-minus (-, U+002D). Unicode has separate hyphen (‐, U+2010)

What most people think of as a hyphen (the key at the top-right of the keyboard) is actually a hyphen-minus (-, U+002D). Unicode has separate hyphen (‐, U+2010) and minus (−, U+2212) symbols, as well as a couple of others. (If you want negative numbers to look right at small font sizes use a minus sign instead of hyphen-minus.)