Vesica piscis
![The intersection of two congruent disks, each centered on the perimeter of the other.](/Images/godic/202502/19/Vesica_piscis_circles.svg5658.png")
![The vesica piscis in Euclid's Elements](/Images/godic/202502/19/Euclid-proof5658.jpg")
![The areas in blue – an equilateral triangle and a segment form together a sector of one sixth of the circle (60°)](/Images/godic/202502/19/Vesica_Piscis5658.jpg")
![The modern cover of the Chalice Well with an artistic rendering of the vesica piscis](/Images/godic/202502/19/Chalice_Well_Cover5658.jpg")
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. The name literally means the "bladder of a fish" in Latin. The shape is also called mandorla ("almond" in Italian).