fraction bar
If it's a fraction then it's the denominator which divides into the numerator
fraction bar
It is the solidus line that separates the numerator from the denominator in a fraction
vinculum
The Vinculum, in some countries, is the name given to the horizontal line used to separate the numerator and denominator in a fraction.
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.
The numerator is the number on the top of the line and the denominator is the number on the bottom
That would be the numerator. The numerator is above the denominator. The numerator divided by the denominator would be equal to the quotient. So, numerator/denominator = quotient
The line separates the numerator and the denominator.
The terms of a fraction are 'Numerator' and 'Denominator.' The numerator is the number atop the dividing line, the denominator is that on the bottom. For example, in 5/7, five is the numerator, and seven is the denominator.
It is called the fraction bar.
vinculum