It is usually called the division bar or the fraction bar
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The number above the line in a fraction is called the numerator. The number below the line is called the denominator. So in the fraction 5/7 5 is the numerator and 7 is the denominator.
The line that separates the top number (numerator) from the bottom number (denominator) of a fraction can be called a dividing line - since this is what is happening in the sum itself to calculate the fraction.
It is the solidus line or bar that separates the numerator from the denominator in a fraction.
Its either called a venscule or a vinculum.
They are called these names: 1. solidus 2. fraction bar 3. division bar