I suppose they could be called a pair, just like two horizontal lines could be called a pair, but it's not a "mathematical" or "technical" term.
The horizontal line is called the horizontal axis
It is called the displacement in the horizontal direction.
the horizontal axis for chart is called X-axis.
because they are parallel to the plane of the horizon
The sport of horse racing over jumps is called steeplechasing, while racing with no jumps is called flat racing.
*Why are jumps called jumps?In order to clear an "obstacle" of any sort, a horse must jump over it. Therefore these "obstacles" became known as jumps.
The horizontal entrance is called a portal. If there are two portals, then you call the excavation a tunnel. If there is only one, it is call a drift or adit.
It is called a bounce.
plank
It is called a horizontal line!
When a whale jumps out of the water it's called Breeching
The horizontal line is called the horizontal axis
I suppose they could be called a pair, just like two horizontal lines could be called a pair, but it's not a "mathematical" or "technical" term.
It is called the displacement in the horizontal direction.
they are called Horizons.
The horizontal axis is also called the x-axis.