A pictorial representation of an object in which all three dimensions are drawn at full scale rather than foreshortening them to the true projection. An isometric drawing looks like an isometric projection but all its lines parallel to the three major axes are measurable.

You can switch between the three 'isoplanes' (top, right, left) by using this command or by pressing the F5 key. Newer versions of Auto CAD have an Isoplane icon on the status bar. You can click this to enter Isometric Drafting Mode as shown below. You can also change your Isoplanes here (but F5 is faster).

Isometric drawing. Isometric drawing, also called isometric projection, method of graphic representation of three-dimensional objects, used by engineers, technical illustrators, and, occasionally, architects.

Isometric projection is a method for visually representing three-dimensional objects in two dimensions in technical and engineering drawings. It is an axonometric projection in which the three coordinate axes appear equally foreshortened and the angle between any two of them is 120 degrees.

Tip: You can quickly cycle through the isometric planes by pressing Ctrl+ E or F5. Turns off isometric drafting. Choosing one of the following options turns on isometric drafting. Specifies creating left-facing planes, defined by the 90-degree and 150-degree axis pair.