A technical drawing or Computer Aided Design (CAD) term.
Isometric projection means you appear to view a drawn 3D cube for example, from the perspective of a corner as opposed to the front / top / side view. It is very useful to show how a 3D object will look when actually made.
An isometric view or 'projection' is one where the angles between the x,y,z axis are all 120 degrees. It also has the property that one unit of length along each axis are exactly the same, which makes drawing to scale with this projection quite easy and natural. An alternative to isometric projection is orthogonal projection where you view an object in three parts - from the top (plan view), front and side view.
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Click on this link: Isometric drawing