  We argue that black holes admit vortex structure. This is based both on a
graviton-condensate description of a black hole as well as on a correspondence
between black holes and generic objects with maximal entropy compatible with
unitarity, so-called saturons. We show that due to vorticity, a $Q$-ball-type
saturon of a calculable renormalizable theory obeys the same extremality bound
on the spin as the black hole. Correspondingly, a black hole with extremal spin
emerges as a graviton condensate with vorticity. This offers a topological
explanation for the stability of extremal black holes against Hawking
evaporation. Next, we show that in the presence of mobile charges, the global
vortex traps a magnetic flux of the gauge field. This can have
macroscopically-observable consequences. For instance, the most powerful jets
observed in active galactic nuclei can potentially be accounted for. As a
signature, such emissions can occur even without a magnetized accretion disk
surrounding the black hole. The flux entrapment can provide an observational
window to various hidden sectors, such as millicharged dark matter.
