**Plus–minus sign - Wikipedia**
https://en.wikipedia.org/wiki/Plus%E2%80%93minus_sign

The plus–minus sign, ±, is a mathematical symbol with multiple meanings. • In mathematics, it generally indicates a choice of exactly two possible values, one of which is obtained through addition and the other through subtraction. • In experimental sciences, the sign commonly indicates the confidence interval or uncertainty bounding a range of possible errors in a measurement, often the standard deviation or standard error. The sign may also represent an incl… In Unicode: .mw-parser-output .monospaced{font-family:monospace,monospace}U+00B1 ± PLUS-MINUS SIGN (±, ±, ±) See also: U+2213 ∓ MINUS-OR-PLUS SIGN (∓, ∓, ∓)

**In Unicode:** .mw-parser-output .monospaced{font-family:monospace,monospace}U+00B1 ± PLUS-MINUS SIGN (±, ±, ±)

**See also:** U+2213 ∓ MINUS-OR-PLUS SIGN (∓, ∓, ∓)

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