Each Cooper pair, having integer spin, can be thought of as a boson.

A boson - a particle that has integer spin.

Particles associated with fundamental forces are bosons and they have integer spin.

We say that fermions have "half integer spin."

Since quarks all have a spin of 1/2, three of them will never add up to an integer spin.

An integer spin is simply 0, 1, or 2.

However, a meson is made of one quark and one antiquark, which each do not have an integer spin.

This is in contrast to bosons (particles with integer spin), any number of which can be in the same state.

Small bipolarons have integer spin and thus share some of the properties of bosons.

In particular, all particles have either half integer or integer spin.