Spin is the rotational momentum of fundamental particles, including combined particles like hadrons and atomic nuclei. The Higgs boson has no spin.

Representation of two spinning spheres with an axis arrow through each. the axis arrow on the sphere labelled electron spin-up points up, and the other sphere labelled positron spin-down points down. they spin in opposite directions.
The electron spins anti-clockwise and the anti-electron (positron) spins clockwise.
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