There is a company called LRAD. It can stand for Long Rang Acoustic Devices which are made by the company called LRAD Corporation. Its effects have been likened to standing in front of a jet engine -- a blast of amplified sound capable of inducing headaches, panic, and potential hearing loss. It can emit a 150-decibel beam of sound and has become increasingly popular as a crowd-control device in the United States and around the world. Is this what you mean? The problem with acronyms is that there are many that may have very different meanings unless you know the context they are being used in.
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