<Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> <P> The plus - minus sign (±) is a mathematical symbol with multiple meanings . </P> <Ul> <Li> In mathematics, it generally indicates a choice of exactly two possible values, one of which is the negation of the other . </Li> <Li> In experimental sciences, the sign commonly indicates the confidence interval or error 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 . </Li> <Li> In engineering the sign indicates the tolerance, which is the range of values that are considered to be acceptable, safe, or which comply with some standard, or with a contract . </Li> <Li> In botany it is used in morphological descriptions to notate "more or less". </Li> <Li> In chemistry the sign is used to indicate a racemic mixture . </Li> <Li> In chess, the sign indicates a clear advantage for the white player; the complementary sign ∓ indicates the same advantage for the black player . </Li> </Ul> <Li> In mathematics, it generally indicates a choice of exactly two possible values, one of which is the negation of the other . </Li>

What does the plus sign over the minus sign mean
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