Plus–minus sign
Symbol combining both + and - signs / From Wikipedia, the free encyclopedia
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For other uses, see Plus–minus (disambiguation).
The plus–minus sign, ±, is a 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 statistics and 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 inclusive range of values that a reading might have.
- In chess, the sign indicates a clear advantage for the white player; the complementary minus-plus sign, ∓, indicates the same advantage for the black player.
Quick Facts ±, In Unicode ...
± | |
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Plus–minus sign | |
In Unicode | U+00B1 ± PLUS-MINUS SIGN (±, ±, ±) |
Related | |
See also | U+2213 ∓ MINUS-OR-PLUS SIGN (∓, ∓, ∓) |
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Other meanings occur in other fields, including medicine, engineering, chemistry, electronics, linguistics, and philosophy.