It is the solidus line or bar that separates the numerator from the denominator in a fraction.
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It is usually called the division bar or the fraction bar
There is no vertical bar in a fraction. A fraction is written with either a horizontal bar or a slanted bar, which is technically called a "vinculum", but most people call it a "fraction bar".
They are called these names: 1. solidus 2. fraction bar 3. division bar
Its either called a venscule or a vinculum.
It's called the vinculum, but it can also be called the fraction bar or division bar.