A line above a mathematical symbol or expression is used in a number of different contexts in mathematics. When placed over is single character or symbol, it is known as a macron; when placed over a larger expression, it is known as a vinculum.

# Overline

## See also

Macron, Vinculum## Explore with Wolfram|Alpha

## Cite this as:

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