What does a horizontal face mean in maths?

In mathematics, particularly in geometry, a horizontal face refers to a flat surface on a three-dimensional shape that is aligned parallel to the horizontal plane. This means that the face does not incline upward or downward and typically has a constant height. For example, in a rectangular prism, the top and bottom faces are horizontal as they run parallel to the ground. Horizontal faces are important for understanding the structure and orientation of 3D objects.