Pendulums

 A pendant (from Old French) is a hanging object, generally attached to a chain or cord.

Dowsing of this type dates back approximately 7000 years but the origins are still unknown. Some believe that when dowsing, you are engaged in a dialog with your Higher Self and other spirit guides who are trying to assist you in obtaining the information you seek and/or accessing the repository of knowledge. Various other theories include electromagnetic, subtle geological forces and ESP.