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The duad represented the line, as being bounded by two points or monads.

It is possible to think of the soul as a reincarnating entity, whether it be a monad, duad, triad, or septenary being.

Two, or the duad, is the symbol of diversity, inequality, division, separation, and vicissitudes.

Eight spheres, each containing five nine-atomed ovoids of a different type, set free, on the meta level, eighty duads—forty positive and forty negative—and forty quintets, which are identical with those in chlorine.

A figure used by Pythagoras, consisting of ten points, arranged in a triangular form so as to represent the monad, duad, triad, and quarterniad.