One of several sounds empty of general meaning and which Bene Gesserit implant within the psyches of selected victims for purposes of control. The sensitized person, hearing the sound, is temporarily immobilized.

In Dune, Lady Fenring is instructed by the Bene Gesserit to seduce Feyd-Rautha Harkonnen in order to "preserve the bloodline" by retrieving his genetic material through conception. She also intends to "plant deep in his deepest self the necessary prana-bindu phrases to bend him", which she later refers to as the "Hypno-ligation of that Feyd-Rautha's psyche". When Paul later fights Feyd to the death, Jessica advises her son to temporarily stun him using the word-sound Uroshnor, typically implanted in a dangerous person who has been prepared by the Bene Gesserit. Paul, however, refuses to use this advantage.