1 The rarer minus-plus sign (â) is not generally found in legacy encodings and does not have a named HTML entity but is available in Unicode with codepoint U+2213 and so can be used in HTML using &#x2213; or &#8723; . 2  In TeX 'plus-or-minus' and 'minus-or-plus' symbols are denoted \pm and \mp, respectively. 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. 2  In chemistry the sign is used to indicate a racemic mixture.
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