They are called these names:
1. solidus
2. fraction bar
3. division bar
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A fraction has two parts. On the top is the numerator, and on the bottom is the denominator. The line separating them is called the vinculum.
It is called a vinculum.
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 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.
the line is called a division bar