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It is a scale model or view.
In first-angle projection, the projectors originate as if radiated from a viewer's eyeballs and shoot through the 3D object to project a 2D image onto the plane behind it. The 3D object is projected into 2D "paper" space as if you were looking at a radiograph of the object: the top view is under the front view, the right view is at the left of the front view. First-angle projection is the ISO standard and is primarily used in Europe.
Basically its just where you position the views of the main object, in first angle projection, if you view the object from the left, the view is drawn to the right of the object, in third angle projection, its drawn on the viewing side.
There is orthogonal drawing with your front, side/s and back view of your object. Isometric and oblique for your overall view of the object. And explode to see how you project are connected together or assembled.
Class diagram represent generalized view of system while object diagram represent view of a system at a particular instant.