Isometric, Oblique and Orthographic Drawing

Isometric means:

• 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