The art of using three principal views of a drawing that represents objects in two dimensions is called "Orthographic Projection." In orthographic projection, three orthogonal views are used to represent an object: the top view (also known as the plan view), the front view (also known as the elevation view), and the side view (also known as the profile view). These views provide a comprehensive representation of the object from different perspectives, allowing engineers and designers to analyze and communicate its shape, dimensions, and features accurately.
