If it's diagonal it's a solidus and if it's horizontal its a vinculum
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The line between the numerator and the denominator of a fraction is the the solidus line
It is the solidus line that separates the numerator from the denominator in a fraction
fraction bar
It is a vinculum
The top line of a fraction is called the "numerator". This serves to "numerate" the number of objects that you are finding a fraction of. For example, in the fraction 3/4, you are finding three quarters of something else.