The lines connecting these points are commonly referred to as projectors.
The centre of projection can be thought of as the location of the observer, while the plane of projection is the surface on which the two dimensional projected image of the scene is recorded or from which it is viewed (e.g., photographic negative, photographic print, computer monitor).
Mathematically, planar projections are linear transformations acting on a point in three-dimensional space
These transformations consist of various compositions of the five transformations: orthographic projection, rotation, shear, translation and perspective.
This is good for maps of close-up areas.