Moons in retrograde orbits are called irregular moons.

Name: Moons in retrograde orbits are called irregular moons.
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Moons that have retrograde orbits (meaning they orbit in the opposite direction of their planet's rotation) are classified as irregular moons. This is because they don't follow the same pattern as the other moons that orbit in a prograde (same direction as planet's rotation) orbit.

Moons in Retrograde Orbits Are Called Irregular Moons