Astrononical devices such as the one depicted here and others placed in this ancient observatory symbolize important functions in acupuncture and are used in several acupuncture pointnames including Conception Vessel 21, "Revolving Machine" and Bladder 29, "Rotational Action" (referring to the "action of specialized acupuncture points located on the back called "Shu Points"). For specific information regarding what these symbols mean in relation to the acupuncture system
