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Learn about the history, usage and meaning of the plus sign (+) and the minus sign (−) in mathematics and other fields. Find out how they are derived from Latin letters, how they are written in different languages and symbols, and how they are used as operators, functions and prefixes.
The plus–minus sign or plus-or-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 .
Learn about the sign of a number, which is its property of being either positive, negative, or 0. Find out how the plus and minus symbols are used to show the sign of a number, and how the sign changes under different operations and contexts.
Learn the meanings and uses of various mathematical symbols, such as + (plus sign), − (minus sign), × (multiplication sign), and more. See examples, syntax, and Unicode and LaTeX renderings of each symbol.
Plus–minus sign (±), a mathematical symbol which can mean either plus (+) or minus (−), or can indicate the uncertainty of a measurement or statistic; Plus–minus (sports), a sports statistic used to measure a player's impact on the game; Plus minus method, a geophysical method to interpret seismic refraction profiles
Learn about the meaning, usage and history of various symbols and signs used in typography, such as + (plus sign), ≈ (almost equal to), ́ (acute accent) and more. See the Unicode name, similar glyphs and related articles for each symbol.
unstrict inequality signs (less-than or equals to sign and greater-than or equals to sign) 1670 (with the horizontal bar over the inequality sign, rather than below it) John Wallis: 1734 (with double horizontal bar below the inequality sign) Pierre Bouguer
Learn the rules and conventions for evaluating mathematical expressions with different operations. The order of operations is also known as PEMDAS, which stands for Parentheses, Exponentiation, Multiplication/Division, Addition/Subtraction.