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1489 (first appearance of minus sign, and also first appearance of plus sign in print) ... braces, a.k.a. curly brackets (for set notation) 1895 Georg Cantor
The Miscellaneous Mathematical Symbols-B block (U+2980–U+29FF) contains miscellaneous mathematical symbols, including brackets, angles, and circle symbols. Miscellaneous Mathematical Symbols-B [1] Official Unicode Consortium code chart (PDF)
A bracket is either of two tall fore- or back-facing punctuation marks commonly used to isolate a segment of text or data from its surroundings. [3] They come in four main pairs of shapes, as given in the box to the right, which also gives their names, that vary between British and American English. [1] "
In mathematics, brackets of various typographical forms, such as parentheses ( ), square brackets [ ], braces { } and angle brackets , are frequently used in mathematical notation. Generally, such bracketing denotes some form of grouping: in evaluating an expression containing a bracketed sub-expression, the operators in the sub-expression take ...
In some applications and programming languages, notably Microsoft Excel, PlanMaker (and other spreadsheet applications) and the programming language bc, unary operations have a higher priority than binary operations, that is, the unary minus has higher precedence than exponentiation, so in those languages −3 2 will be interpreted as (−3) 2 ...
To really get a minus sign, use the "minus" character "−" (reachable via selecting "Math and logic" in the drop-down list below the edit box or using {{subst:minus}}) or use the "−" entity. Square brackets
An open bracket without closing parenthesis (unless missing closing parenthesis is at very end of equation) Using minus sign instead of negative symbol (or vice versa), which are distinct on most scientific calculators. Note that while some scientific calculators allow a minus sign to stand in for a negative symbol, the reverse is less common.
(three ASCII periods) is used instead of "…" (single character) Arrow (symbol) § Arrows in Unicode; Mathematical operators and symbols in Unicode; Wikipedia:Manual of Style (mathematics) For more on special characters: Unicode character name index can be used to find the Unicode number of a character. W3C list of MathML characters indexed by ...