It is the solidus line that separates the numerator from the denominator in a fraction.
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It means the numerator is being divided by the denominator.
There are three parts to a fraction, there is the numerator (the top number), the denominator (the bottom number) and the vinculum (the line in the middle which means 'divide by'-
This is the denominator, which is the bottom line of the fraction.
It's sometimes known as the 'divison bar' or '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.