The Line that separates the numerator and the denominator. It is also called as Vinculum.
It is the solidus line that separates the numerator from the denominator in a fraction
Restate the question: What is the name for a line that crosses two parallel lines? Transversal
A line with two end points is called a line segment:)
The portion of a line that falls between two points is called a line segment.
A divide
The name of the line on a map that separates two countries is typically called a border or boundary.
A line that separates two places is a boundary line.
Watershed
A divide.
A line of symmetry divides a figure into two matching halves.
The Line that separates the numerator and the denominator. It is also called as Vinculum.
The line that separates the land from the sky is called the horizon. It appears straight but is actually curved due to the Earth's round shape. This line is where the sky meets the Earth's surface, providing a visual boundary between the two.
There is one line, the equator, that separates the northern from the southern hemisphere.
I think you refer to the Watershed.... say rain falls on a mountain side & some of it eventually flows into the River Anything & some flows into the next valley, the River Zoobeedoobeedoo. Where the dividing line is, (Between the Anything & the Zoobeedoobeedoo) is the Watershed.
A watershed is the area separating two different drainage basins/river systems.
A line that bisects an angle into two different congruent angles is called an angle bisector.