TBH I'm not sure I totally understand the question but projection is very useful to decompose the orientation of elements, like a cylinder that you just measured with a machine or a scanner. The coordinates and orientation (angles) can be projected in the three main planes XY, YZ and ZX.
It's really weird to me. As a teen I loved telling the world what I was listening because it was obviously the best thing on earth, man.
I work in 3D metrology and the consensus is right handed and Z up. Had no idea left handed existed!
Le mec il parle d'un truc qu'il a découvert et qu'il aime et... il file aucun lien... tssss secouer ma tête.
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