The same is true for the direction black holes rotate: They can spin either clockwise or counterclockwise. Astronomers have seen no evidence that black holes have “handedness,” meaning they tend to spin one way or the other.
Most large galaxies appear to host central supermassive black holes. We can tell which direction such black holes spin by observing the jets of matter and energy they expel in opposite directions.
Theoretical studies indicate the jets align parallel to the spin axis of the black hole that generates them and also rotate in the same direction. But when we observe galaxies, it’s clear that they and their supermassive black holes don’t necessarily rotate in the same directions. — Eliot Quataert, Theoretical Astrophysics Center, University of California at Berkeley