point
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line or graph on a line in a math equation
I'm inclined to say that would be a point- a place of which the definite position alone is considered; spot
Vertical means up and down. A horizontal line goes from the left to the right (or from the right to the left) like this: ----------------------------- A horizontal line goes from a position that is low to a position that is high (or from a position that is high to a position that is low) like this: | | | | | | | | But the word "vertical" does not tell you which direction the line is drawn, just the it is a line.
It is called a horizontal line!
The line perpendicular to a barrier is called the normal.