  We determine the complete set of generalized spin squeezing inequalities,
given in terms of the collective angular momentum components, for particles
with an arbitrary spin. They can be used for the experimental detection of
entanglement in an ensemble in which the particles cannot be individually
addressed. We also present a large set of criteria involving collective
observables different from the angular momentum coordinates. We show that some
of the inequalities can be used to detect k-particle entanglement and bound
entanglement.

Quantum Physics;Quantum Gases;Atomic Physics