[truculent]

Is using quantum mechanical spin a fair comparison? Isn't it moving the goalposts a bit?

> As the name suggests, spin was originally conceived as the rotation of a particle around some axis. Historically orbital angular momentum related to particle orbits. While the names based on mechanical models have survived, the physical explanation has not. Quantization fundamentally alters the character of both spin and orbital angular momentum.

> The classical analog for quantum spin is a circulation of energy or momentum-density in the particle wave field: "spin is essential a wave property".

https://en.wikipedia.org/wiki/Spin_(physics)