Tetrad (symbol)
Encyclopedia
The tetrad or number four is the first number formed by the addition and multiplication of equals. To the Pythagoreans
Pythagoreanism
Pythagoreanism was the system of esoteric and metaphysical beliefs held by Pythagoras and his followers, the Pythagoreans, who were considerably influenced by mathematics. Pythagoreanism originated in the 5th century BCE and greatly influenced Platonism...

, this symbol and number represented justice as it is the first number that is divisible every way into equal parts.

See also

  • Monad
    Monad (Greek philosophy)
    Monad , according to the Pythagoreans, was a term for Divinity or the first being, or the totality of all beings, Monad being the source or the One meaning without division....

  • Dyad
  • Triad
  • Pentad
  • Decad
  • Tetractys
    Tetractys
    The tetractys , or tetrad, is a triangular figure consisting of ten points arranged in four rows: one, two, three, and four points in each row...

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