- coordinate axes appear equally foreshortened and the angles between any two of them are 120 degrees.
- Used in technical and engineering drawings.
Oblique can mean:
- perpendicular
- not straightforward
- indirect
- obscure
Orthographic Drawing is:
- Form of Parallel Projection
- Orthogonal to projection plane.
All the above information are adapted as follows:
Isometric: http://en.wikipedia.org/wiki/Isometric_projection
Oblique: http://en.wikipedia.org/wiki/Oblique
Orthographic projection: http://en.wikipedia.org/wiki/Orthographic_projection