EAP vocabulary: Learning

Unknown Words

What can you work out about the meaning of tetracys from the following text?

Bede was the first Englishman to describe the theory of the four "ages of man". For the source of this we must go back to the Pythagoreans of the sixth century BC, whose cosmological speculations were based on the "tetracys", that is, the geometrical symbol composed of ten discrete points symmetrically arranged in the form of an equilateral triangle with sides of four points each.

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