  The spin susceptibility is an important probe to characterize the symmetry of
the order parameter in unconventional superconductors. Among them, nonunitary
triplet superconductors have attracted a lot of attention recently in the
context of the search for topological superconductivity. Here, we derive a
general formula for the spin susceptibility of nonunitary triplet
superconductors within a single-band model of non-magnetic, centrosymmetric
materials with strong spin-orbit coupling. We use it to critically assess
experimental claims of nonunitary triplet superconductivity in some materials.
