It's called a vinculum.
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It is the solidus line that separates the numerator from the denominator in a fraction
A vulgar fraction is a common fraction which is written as one integer (whole) number over another integer with a line between the two, for example 3/4.The line separating the two numbers can be sloping (as above) or horizontal, as in:3-4but this latter form is not always easy to display and use on a computer (especially here).
The solidus
It is a vinculum
The top line of a fraction is called the "numerator". This serves to "numerate" the number of objects that you are finding a fraction of. For example, in the fraction 3/4, you are finding three quarters of something else.