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.
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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 usually called the division bar or the fraction bar
The line separating the numerator and denominator when displayed as one number over another is called Vinculum, or sometimes referred to as the fraction bar. If the line is a slanting line (such as in "9/10"), it's referred to as the solidus.
On the number line it is 3/1
It is the solidus line or bar that separates the numerator from the denominator in a fraction.