Definition:Tetractys

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Definition

The tetractys is a central concept in the mystical beliefs of the Pythagoreans.

It consists of $10$ points arranged in a triangle:


Tetractys.png


based on the notions that:

$1$ represents the point
$2$ represents the line
$3$ represents the surface
$4$ represents the solid
$1 + 2 + 3 + 4 = 10$

and therefore:

$10$ represents the universe.


Also known as

Some sources give this as tetraktys.


Sources