A dowsing pendulum is typically a rock or crystal that hangs on the end of a string or chain. The pendulum is used as a way of gaining spiritual and material insight. Traditionally, dowsing pendulums were used to locate hidden water, minerals, and other hidden objects beneath the ground. When we ask a question, our unconscious mind responds by influencing the nerve endings in our fingers causing the pendulum to swing in response. In other words, our body outwardly expresses our inner knowing.