The Vesica Piscis served as an appropriate symbol for the Yoni, vulva and represented the feminine creative force, the Mother-Spirit birthing gods and worlds. It also carried the meaning of the "seat of the female sexual power”.
It is often seen in medieval Christian art as a distinct frame around holy figures, and was called Mandorla (literally meaning "Almond”).
As a female form, in Sanskrit, it was referred to as
"Jagad Yoni” meaning the "Womb of the World”.
(from VESICA PISCES The MOTHER Of ALL FORMS
Written by JAIN 108)