it is the Transverse plane.
the transverse, or horizontal plane is a crosswise plane that runs parallel to the ground. this imaginary cut would divide the body or its parts into upper and lower portions.
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A horizontal angle is an angle between lines on a horizontal plane.
because they are parallel to the plane of the horizon
Horizontal plane Frontal plane
Any flat surface that is not coplanar with the horizontal plane.
On the Cartesian plane the horizontal number line is the x axis.