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The plus-minus sign (±) is a mathematical symbol commonly used to indicate the precision of an approximation, or as a convenient shorthand for a quantity which has two possible values opposite in sign. In mathematics, the sign is pronounced "plus or minus" and indicates that there are exactly two possible answers, one of which is positive and one of which is negative. In most experimental sciences however, the sign is pronounced "give or take" and it indicates an inclusive range of values that a reading might have. The plus-minus sign does not mean "approximately".
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