From primitive society to present, some commonly accepted symbols of life also have functional characteristics in social beliefs and taboos. A dot is usually a symbol of  god. To wear on the chest, it is a symbol of patron-saint;  to draw a dot on an animal figure, the animal becomes a  supernature symbol. I saw such a dot on a pottery pig  unearthed from 7000-year-old Hemudu cultural relics. It
 should be a legendary pig which was in the category of the sun animals. On the rock carving in Leisike, France dated back 15000 years
ago, the legendary ox was also labeled with a dot. Obviously5,it had been a recognized philosophical and cultural code for tike entire mankind and had been around for some 15000 years.