Prison Moon: The planet of Gor has three moons, one large one and two small ones. Only one of the moons has been given a name in the books. The other two moons likely have names but they simply have not been listed in the books yet. One of the small moons is called the Prison Moon. Unfortunately, there is no reason given for its name.

We can speculate on many different rationales for the appellation though we cannot be sure. The shadows on the moon may resemble bars like a prison cell though if that is so, Tarl Cabot would likely have remarked on it. There could be legends that some person or creature was imprisoned on the moon by the Priest-Kings. Maybe one day we will learn the reasons.