If it's a fraction then it's the denominator which divides into the numerator
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It is called a border.
The denominator in the unsimplified fraction.
It is called a bisector.
The number above the line is the numerator. The number below the line is the denominator.
A boundary line is the dividing line between parcels of real property. It is sometimes a line that is surveyed according to the property's legal description, and sometimes the result of adverse possession (see link below).