A horizontal line placed above multiple quantities to indicate that they form a unit. It is most commonly used to denote
1. A radical (),
2. Repeating decimals (),
3. The line segment joining two points and ,
4. The complex conjugate , or
5 Negation of a logical expression, .
See also
Bar, Long Division Symbol, Macron, Radical, Solidus
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References
Bringhurst, R. The Elements of Typographic Style, 2nd ed. Point Roberts, WA: Hartley and Marks, p. 286, 1997.
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Cite this as:
Weisstein, Eric W. "Vinculum." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/Vinculum.html