In David Lynch's Dune movie, the Weirding Module is a sonic beam weapon that translates certain specific sounds into attacks of varying potency. These devices are not present in the original novels by Frank Herbert.
The sounds that the device translates into attacks are presented as being somewhat rare. For that reason, everyone is startled when, during the training of the Fremen in the use of the Weirding Module, a devastating beam shoots from the weapon when the warrior wearing the device speaks Paul's Fremen name, "Muad'Dib," while wearing it.
Originally in the novel, this line referenced the holy war beginning in Paul's name, however, in the context of the name being a trigger for the modules, it became somewhat more literal.
Behind the scenes
Director David Lynch's decision to use modules was taken because he found the idea of the Weirding Way unworkable on film, stating he did not want to see "Kung-fu on sand dunes". The Weirding Module was later seen in the computer games Dune and Emperor: Battle for Dune as powerful hand-held weapons used by the Fremen Fedaykin special unit.
Types of "Sonic-weaponry" are briefly alluded to in Chapterhouse: Dune and Heretics of Dune, but these seem to have been either instruments for detection of underground facilities, of psychological warfare or maybe crowd-control rather than weapons of mass-destruction.
- Herbert & Lynch, Dune Motion Picture, Scene 210