the horizontal line between numbers in a fraction is called a vinculum
![the horizontal line between numbers in a fraction is called a vinculum](https://images.squarespace-cdn.com/content/v1/5983dc02d7bdcee0bc8e54bf/1501818843624-VVFYSRK6GHH5FAKFLN11/image-asset.png)
A vinculum is a horizontal line used in mathematical notation. It may be placed as an overline over a mathematical expression to indicate that the expression is to be considered grouped together, or alternatively it may function as a binary connective between arguments appearing above and below it, in particular as a fraction bar.
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