Meaning of vesica piscis

ve•si•ca pis•cis

Pronunciation: (vu-sī'ku pī'sis, pis'is vu-sē'ku pis'kis, ves'i-ku), [key]
— Fine Arts. Fine Arts.
  1. an elliptical figure in pointed form, usually one made by the intersection of two arcs and used, esp. in early Christian art, as an emblem of Christ.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.