MEANS:Light: Projection: On Plane

Axonometric projection is a type of parallel projection, more specifically a type of orthographic projection, used to create a pictorial drawing of an object, where the object is rotated along one or more of its axes relative to the plane of projection.[1]
There are three main types of axonometric projection:  

isometric,
the most commonly-used form of axonometric projection in engineering drawing,[9] the direction of viewing is such that the three axes of space appear equally foreshortened, of which the displayed angles among them and also the scale of foreshortening are universally known. However in creating a final, isometric instrument drawing, in most cases a full-size scale, i.e., without using a foreshortening factor, is employed to good effect because the resultant distortion is difficult to perceive.[clarification needed] Another advantage is that, in engineering drawings, 60° angles are more easily constructed using only a compass and straightedge.[clarification needed]

sometric of a Cube
Ervin Kenison, S. B. and Edward B. Waite, S. B. Mechanical Drawing (Chicago: American School Of Correspondence, 1917) Part III: Page 115