The vesica piscis is a shape that is the intersection of two disks with the same radius, intersecting in such a way that the center of each disk lies on the perimeter of the other.[1] The name literally means the "bladder of a fish" in Latin. The shape is also called mandorla ("almond" in Italian). -wiki
Vesica Piscis takes us to creation and sacred geometry. The circles represent the female (ovum) and the oval the male (opening of the penis, sperm, shape of the eye ... of creation, god, etc.)
- source: http://www.crystalinks.com/vesicapiscis.html