Tetractys, or tetrad, or tetractys of the decad. A triangular figure, consisting of ten points, arranged in four rows. It was an important mystical symbol in the secret worship of the Pythagoreanism. Poster #548669120
Tetractys, or tetrad, or tetractys of the decad. A triangular figure, consisting of ten points, arranged in four rows. It was an important mystical symbol in the secret worship of the Pythagoreanism. Poster #548669120
