One remaining drawing conventions is Oblique drawing -

In this convention the angles used are 45 degrees and 90 degrees. The only difference between the two named styles is in the scale of the dimension going away from the viewer. This first example is Cavalier Oblique and shows the full scale (1:1) in the axis

Cabinet Oblique'

In Cabinet oblique the scale (depth) is halved whilst in Cavalier

oblique the depth scale is the same as in the X and Y directions.

internal oblique opposes the external oblique

* any grammatical case other than the nominate.

* slanting or inclined in direction or course or position.

Oblique lines:

Oblique means at an angle.