Pythagorean Tetrad Add to favorite DMCA Complaint Tweet Pythagorean Tetrad FreeClip art by Alkon Free Download License: CC0 1.0 Universal (CC0 1.0) ID: 96943 Tags: sacred, divine, spiritual, symbol, pagan, emblem, swastika, occult, hieroglyph, esoteric, ideograph, metaphysical, theosophical, tetraktys