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16. The 2d Sri Yantra embodies the number of edges of the 4_{21} polytope

Constructed from Type A triangles, the 2d Sri Yantra embodies the number 6720 when each extra yod is assigned the number 10. 
A Type A triangle contains 19 yods. Of these, three are corners, so that 16 more yods are needed to turn a simple
triangle into a Type A triangle. The 42 triangles surrounding the centre of the 2d Sri Yantra contain (42×16=672)
yods other than their 68 corners when they are Type A triangles. In other words, 672 more yods are
needed to transform the 42 triangles into Type A triangles. When each yod is weighted with the number 10 (Decad),
the 2d Sri Yantra embodies the number 6720. This is the number of edges in the 4_{21} polytope.
Although traditionally regarded as a triangle, the central, downwardpointing, threesided figure is not, from a pure mathematical point of view, a triangle because the bindu symbolising the Absolute is assigned to its centre in the case of the 2d Sri Yantra. For this reason, it is not legitimate to treat this figure as a Type A triangle on the same par as the 42 triangles that surround it.
Of the 672 yods in the 42 Type A triangles, 42 are corners of tetractyses, leaving 630 hexagonal yods. The number 630 is the number value of Seraphim, the Order of Angels assigned to Geburah.
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