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H = g [itex]\Sigma[/itex][itex]^{2}_{s=1}[/itex][itex]\mu[/itex][itex]\bullet[/itex][itex]\epsilon[/itex]

_{s}[itex]\sigma^{-}[/itex]a[itex]^{+}_{s}[/itex] + h.c.

where [itex]\sigma^{-}[/itex] is Pauli spin-flip operator and a[itex]^{+}_{s}[/itex] is the creation/annihilation operator.

What does "h.c." stand for in this formula?