Jar is a container or a vessel, often a sacred vessel. Symbolically, the potters’ wheel as great god Vishnu’s discus spins out the Hindu creation myth. As the universe was set in motion, so is the soft clay first spun to the center of the wheel, the primordial still point, where it naturally assumes the shape of a linga -- the male principle. Next the potter opens a yoni -- the female principle -- which is shaped like a womb and will become pregnant with the potter’s creative energy. After this marriage, he can birth any form http://www.jimdanisch.com/lastwaterjarmay03.htm Yakushi Nyoriai: and it usually holds a jar of medicine in its right hand (although the oldest statues do not). The jar is said to contain a miraculous emerald whose radiance is capable of curing any illness.