Well, an isometric drawing is a method of visually representing three-dimensional objects in two dimensions, in which the three coordinate axes appear equally foreshortened and the angles between any two of them are 120 degrees. It simply means a pictorial view of a three-dimensional object. A dictionary says that an isometric drawing is a method of nonperspective pictorial drawing in which the object being drawn is turned so that three mutually perpendicular edges are equally foreshortened(which means having less depth). The meaning of the word 'isometric' in the dictionary is of or having equal dimensions.
What exactly is oblique projection? Oblique projection is a simple type of graphical projection which is used for producing pictorial, two-dimensional images of three-dimensional objects. It is designed to show a three-dimensional view of an object. It can be cuboids, cubes, etc. According to WikiAnswers, it is a kind of a drawing that shows one face of the object in its true shape, but the other faces in a distorted angle. I also found out the word 'oblique' means slanting; neither parallel nor at a right angle to a specified or implied line.
Orthographic projection is a drawing that communicates the shape and size of an object through a series of related two-dimensional views. A drawing, depiction or a map can be made using this method.
Pictures(from top to bottom): Orthographic, oblique and isometric drawing.
ORTHOGRAPHIC DRAWING: www.tpub.com/
OBLIQUE DRAWING: www.ider.herts.ac.uk/.../
ISOMETRIC DRAWING: www.bbc.co.uk/.../
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