Overview

An Axonometric is a parallel projections onto an oblique plane.  Axonometric projections have the advantage that they give a pictorial view of the object, yet all dimensions remain undistorted, and are measurable.

See:

Kyle Platts, ‘Festival Frenzy’ - https://www.itsnicethat.com/articles/illustration-kyle-platts-festival-frenzy
E-Boy - https://www.theverge.com/2014/6/17/5803850/pixel-perfect-the-story-of-eboy
Rndrd - https://rndrd.com/?p=431