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The vesica piscis is the intersection of two congruent disks, each centered on the perimeter of the other. The vesica piscis is a type of lens, a mathematical shape formed by 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]
Interlaced triquetra which is a trefoil knot. The triquetra (/ t r aɪ ˈ k w ɛ t r ə / try-KWEH-truh; from the Latin adjective triquetrus "three-cornered") is a triangular figure composed of three interlaced arcs, or (equivalently) three overlapping vesicae piscis lens shapes.
The aureola, when enveloping the whole body, generally appears oval or elliptical in form, but occasionally depicted as circular, vesica piscis, or quatrefoil. When it appears merely as a luminous disk round the head, it is called specifically a halo or nimbus, while the combination of nimbus and aureole is called a glory.
The two interlocking circles constitute the symbol known as the Vesica Piscis. In the well lid design, a spear or a sword bisects these two circles, a possible reference to Excalibur, the sword of the legendary King Arthur, believed by some to be buried at the nearby Glastonbury Abbey. Foliage represents the Glastonbury Thorn. Bligh Bond wrote ...
The center lens of the 2-circle figure is called a vesica piscis, from Euclid. Two circles are also called Villarceau circles as a plane intersection of a torus. The areas inside one circle and outside the other circle is called a lune. The 3-circle figure resembles a depiction of Borromean rings and is used in 3-set theory Venn diagrams.
Such an aureola is often a mandorla ("almond-shaped" vesica piscis), especially around Christ in Majesty, who may well have a halo as well. In depictions of the Transfiguration of Jesus a more complicated shape is often seen, especially in the Eastern Orthodox tradition, as in the famous 15th century icon in the Tretyakov Gallery in Moscow .
A form of the Triquetra symbol which has the exact geometrical proportions to be composed of three overlapping Vesica piscis symbols — something which is important to a few authors of books on Christian symbolism. (Ribbons version
The vesica piscis is a symbol made from two circles of the same radius, intersecting in such a way that the center of each circle lies on the circumference of the other. The name literally means the bladder of the fish in Latin.