87 Spin

The intrinsic angular momentum carried by elementary particles, an inherent quantum property with no classical counterpart from physical rotation.

definition [d] (Electron Spin = Spin Angular Momentum = Intrinsic Angular Momentum) — Intrinsic angular momentum of an electron, characterized by quantum number 1/2 and represented mathematically by spinors. Ref: Arfken, Weber & Harris, Mathematical Methods for Physicists, 7th ed. (2013).