Comment by nayuki

Minus wasn't mentioned in the article, but the distinction between hyphen-minus (U+2D) and minus sign (U+2212) is very important.

When you put plus and minus side by side (+−) such as in a financial context, the two horizontal lines should be in the same vertical position and both characters should have the same width. Whereas plus and hyphen-minus (+-) will have the hyphen-minus narrower and higher/lower.