  Topological superconductors are exotic phases of matter featuring robust
surface states that could be leveraged for topological quantum computation. A
useful guiding principle for the search of topological superconductors is to
relate the topological invariants with the behavior of the pairing order
parameter on the normal-state Fermi surfaces. The existing formulas, however,
become inadequate for the prediction of the recently proposed classes of
topological crystalline superconductors. In this work, we advance the theory of
symmetry indicators for topological (crystalline) superconductors to cover all
space groups. Our main result is the exhaustive computation of the indicator
groups for superconductors under a variety of symmetry settings. We further
illustrate the power of this approach by analyzing four-fold symmetric
superconductors with or without inversion symmetry, and show that the
indicators can diagnose topological superconductors with surface states of
different dimensionalities or dictate gaplessness in the bulk excitation
spectrum.
