**Plus and minus signs - Wikipedia**
https://en.wikipedia.org/wiki/Plus_and_minus_signs

In physics, the use of plus and minus signs for different electrical charges was introduced by Georg Christoph Lichtenberg. In chemistry, superscripted plus and minus signs are used to indicate an ion with a positive or negative charge of 1 (e.g., NH+ 4 ). If the charge is greater than 1, a number indicating the charge is written before the sign (as in SO2− 4 ). The minus sign is also used, in place of an en dash, for a single … In Unicode: .mw-parser-output .monospaced{font-family:monospace,monospace}U+002B + PLUS SIGN (+), U+2212 − MINUS SIGN (−)

**In Unicode:** .mw-parser-output .monospaced{font-family:monospace,monospace}U+002B + PLUS SIGN (+), U+2212 − MINUS SIGN (−)

**DA:** 13 **PA:** 67 **MOZ Rank:** 56