One nice perspective on what angular momentum _is_: It's a consequence of the laws of physics being the same for all directions. Noether's theorem can be para

One nice perspective on what angular momentum _is_: It's a consequence of the laws of physics being the same for all directions. Noether's theorem can be paraphrased as: If a system has a continuous symmetry property, then there are corresponding quantities whose values are conserved in time. If the laws of physics are the same even if your coordinate system is rotated that means there is a continous symmetry for that. When The conserved property is written out is is angular momentum.