The line between the numerator and the denominator of a fraction is the the solidus line
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The solidus
divider
Numerator
the vinculum
The top number is called the numerator and the bottom number called the denominator. The line that usually separates the numerator and denominator. If slanting it is called a solidus or forward slash, for example 3⁄4. If the line is horizontal, it is called a vinculum or, informally, a "fraction bar"