Oblique
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if the slope is 0, the line is horizontal.
No, the horizon is horizontal. A vertical line is perpendicular to the horizon.
A line which divides a body into two parts, such that each part is the mirror image of the others, then the line is called a line of symmetry. If such a line is parallel to the horizontal plane, then it is called a horizontal line of symmetry. Else, if the line of symmetry is perpendicular to the horizontal plane then it is a vertical line of symmetry.
It is a vertical line touching a horizontal line
vertical - - - - - - - - - - horizontal -------------------------------