“The Yosher is a distinctly anthropomorphic form of the Name.
It is encircled by the Leviathan of Vast Face, described as a “snake devouring its tail.”
The Leviathan acts as a circular “fence” around the Yosher and defines the field of superimposition.
It also displays the ubiquitous mystical principle that “the end is contained in the beginning.”
–Daniel Feldman, Qabala: The Mystical Heritage of the Children of Abraham, 2001, pg. 66.