The Golden Ratio
For an interesting starting point on this subject see:
Spirals in ancient art
“The Healer’s Hand, also known as the Shaman’s Hand, is an ancient symbol of healing and protection. The image consists of a hand with a spiral palm and it is believed to have come from the Native American solar hieroglyphs that have been found in a number of places in the south-western part of the United States.
The spiral is a universally accepted symbol of eternity and in some traditions, it also symbolizes the deity or the Spirit. When the solar spiral is used to the make the shape of a hand, the resulting figure is believed to be infused with therapeutic energy. Therefore, the Healer’s Hand is considered to be representative of the curative powers of a Shaman”.
Ancient Symbols. 2017. Healer’s Hand Symbols. [ONLINE] Available at: http://www.ancient-symbols.com/symbols-directory/healer_hand.html. [Accessed 22 May 2017].