Plus–minus 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 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. * In medicine, it means "with or without". * 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. * In botany, it is used in morphological descriptions to notate "more or less". * In chemistry, the

Plus–minus 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 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. * In medicine, it means "with or without". * 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. * In botany, it is used in morphological descriptions to notate "more or less". * In chemistry, the