This symbol symbolizes: 
Serpent:
The serpent represented the rebirth of the souls in the Underworld. Serpents were familiar creatures of healing, fertility and rebirth in the Celtic territories. 
Celtic knot:
The meaning of this Celtic Knot is commonly considered to signify the three forces of nature: water, fire and earth. The single line is said to signify the oneness of the spirit and the spirals represent growth. The gaps in the spirals symbolise the stages of life: life, death and rebirth.
 
7 x 6,5 cm