File:Tetractys.svgDescriptionTetractys.svg The Tetractys is a triangular figure consisting of ten points arranged in four rows: one, two, three, and four points in each
File:Tetragrammaton-Tetractys.pngDescriptionTetragrammaton-Tetractys.png English: Diagram of the Hebrew letters of the Tetragrammaton arranged in a Tetractys shape, showing that by the
File:First six triangular numbers.svgDescriptionFirst six triangular numbers.svg English: The first size triangular numbers: 1, 3, 6, 10, 15, and 21. Date 9 October 2011 Source Own work Author
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