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![1478 drawing by Theodoros Pelecanos], in alchemical tract titled Synosius.](http://upload.wikimedia.org/wikipedia/commons/thumb/f/fa/Ouroboros.png/300px-Ouroboros.png)
The Ouroboros is an ancient symbol depicting a serpent or dragon swallowing its own tail and forming a circle. The ouroboros has been important in religious and mythological symbolism, but has also been frequently used in alchemical illustrations.