A macron is a bar placed over a single symbol or character, such as . The symbol is sometimes used to denote the following operations:

1. The complex conjugate .

2. The mean (a.k.a. arithmetic mean)
of a set of values .

3. Negation of a logical expression.

4. Infrequently, the adjoint operator.

A bar placed over multiple symbols or characters is called a vinculum.

## See also

Adjoint,

Arithmetic Mean,

Bar,

Complex Conjugate,

Hat,

Mean,

Vinculum
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## References

Bringhurst, R. *The Elements of Typographic Style, 2nd ed.* Point Roberts, WA: Hartley and Marks,
p. 281, 1997.## Referenced on Wolfram|Alpha

Macron
## Cite this as:

Weisstein, Eric W. "Macron." From *MathWorld*--A
Wolfram Web Resource. https://mathworld.wolfram.com/Macron.html

## Subject classifications