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“We are going to strive for the perception of the qualities and wholes of the triads and hexads in the event of musical performances.’

This is the hexad axis or hexagonal axis, for which the angle of rotation is 60�, or one-sixth of 360�.

In this type of symmetry, of which apatite is the best example, there is only one plane of symmetry, which is perpendicular to the hexad axis.

Their bombs and torpedoes ripped and tore into the structure beneath the invulnerable shield and exploded, demolishing and hurling aside like straws, the walls, projectors, hexads and vast mountains of earth.

An element having a valence of one is a monad; of two, a dyad; three, a triad; four, tetrad; five, pentad; six, hexad, etc.