Tetrad

Tetrad has a variety of meanings

For the theory, see Cartan connection applications
For the chromosomal formation, see meiosis.
For the polyomino, see tetromino.
For the music theoretic concept, see tetrachord.

A set or group of four

A tetra-valent atom, radical, or element

Tetradic (or double complimentary): a complimentary pair of colors (opposites), then a second pair to use in tandem. http://www.wisegeek.com/what-is-a-color-wheel.htm

Marshall McLuhan and Bruce Powers' concept of the tetrad http://www.anthonyhempell.com/papers/tetrad/index.html

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