Tetractys

The tetractys (τετρακτύς), or tetrad, is a triangular figure consisting of ten points arranged in four rows: one, two, three, and four points in each row, which is the geometrical representation of the fourth triangular number. As a mystical symbol, it was very important to the secret worship of the Pythagoreans. ==Pythagorean symbol== A ...
Found on http://en.wikipedia.org/wiki/Tetractys

Tetractys

Literally the Greek term signifies, an aggregate of four, specifically it was applied to the Pythagorean perfect number, ten, which is the sum of one, two, three, and four. -- J.J.R.
Found on http://www.ditext.com/runes/t.html
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