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An overline, overscore, or overbar, is a typographical feature of a horizontal line drawn immediately above the text. In old mathematical notation, an overline was called a vinculum, a notation for grouping symbols which is expressed in modern notation by parentheses, though it persists for symbols under a radical sign.
meaning to add b and c first and then subtract the result from a, which would be written more commonly today as a − (b + c). Parentheses, used for grouping, are only rarely found in the mathematical literature before the eighteenth century. The vinculum was used extensively, usually as an overline, but Chuquet in 1484 used the underline ...
A mathematical symbol is a figure or a combination of figures that is used to represent a mathematical object, an action on mathematical objects, a relation between mathematical objects, or for structuring the other symbols that occur in a formula. As formulas are entirely constituted with symbols of various types, many symbols are needed for ...
The overline is a typographical symbol similar to the macron, used in a number of ways in mathematics and science. For example, it is used to represent complex conjugation : z = a + b i ; z ¯ = a − b i {\displaystyle z=a+bi;\quad {\overline {z}}=a-bi}
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)
The following table lists many specialized symbols commonly used in modern mathematics, ordered by their introduction date. The table can also be ordered alphabetically by clicking on the relevant header title.
The OpenType math table allows adding this overline following the radical symbol. Legacy encodings of the square root character U+221A include: 0xC3 in Mac OS Roman and Mac OS Cyrillic; 0xFB (Alt+ 2 5 1) in Code page 437 and Code page 866 (but not Code page 850) on DOS and the Windows console; 0xD6 in the Symbol font encoding [6]
Later versions of Unicode extended this set to all uppercase and lowercase Latin letters and a variety of other symbols, among the "Mathematical Alphanumeric Symbols". [19] In professionally typeset books, publishers and authors have gradually adopted blackboard bold, and its use is now commonplace, [14] but some still use ordinary bold symbols.