double headed serpent

Many theories suggest the symbolic significance of the serpent imagery. It has been proposed that the serpent was a symbol of rebirth because of its ability to shed its old skin and appear as a reborn snake. It may have been a representation of the earth and underworld with each head representing one. The snake features strongly in the gods that the people worshiped. The feathered serpent god Quetzalcoatl, patron of priests and symbol of death and resurrection was important to Mixtec religion,^[​2] but other gods also had serpentine characteristics. Both the colour green and serpents signified fertility, and ensuring land fertility was at the heart of most Aztec ceremonies. Turquoise evoked new growth, water and the feathers of the quetzal bird, which were worn by priests during ceremonies. The bright turquoise skin and open jaws where intended to both impress and terrify the beholder.

However, the best known craftsmen for their turquoise mosaics were not the Aztecs but the Mixtecs. At the height of the Aztec Empire, many Mixtec towns came under Aztec rule had to pay tribute to the emperor, including gifts of gold and turquoise. This serpent would have made an valuable item of tribute- an example of the fearsome Aztecs.

^{https://en.wikipedia.org/wiki/Double-headed_serpent}