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I do not think force, or charge, or any of the other expressions which occur to one's mind is a good translation for Ur, and I prefer to regard it as an expression best left untranslated, though perhaps one could say that Ur is whatever it was that satisfied the gravitational equations of Misk. - (Priest-Kings of Gor, Chapter 28, Sentence #223)

The ship was simply a transportation disk whose underside was coated with cage plastic and whose top was a transparent dome of the same material. There were controls in the forward portion of the ship and ports about the sides for silver tubes. There were no propellers or jets or rockets and I find it difficult to understand or explain the drive save that it used the forces of gravity against themselves in such a way that the amount, if one may use so inept an expression, of gravitational Ur, which is the Gorean expression for the gravitational primitive, remains constant though redistributed. I do not think force, or charge, or any of the other expressions which occur to one's mind is a good translation for Ur, and I prefer to regard it as an expression best left untranslated, though perhaps one could say that Ur is whatever it was that satisfied the gravitational equations of Misk. Most briefly, the combined drive and guidance system of the disk functioned by means of the focusing of gravitational sensors on material objects and using the gravitational attraction of these objects while in effect screening out the attraction of others. I would not have believed the ship was possible but I found it difficult to offer the arguments of my old world's physics against the fact of Misk's success. Indeed, it is through the control of gravity that the Priest-Kings had, long ago, brought their world into our system, an engineering feat which might have been otherwise impossible without perhaps the draining of gleaming Thassa itself for its hydrogen nuclei. - (Priest-Kings of Gor)