Tetrad
A tetrad is a "group of four".
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Tetrad or tetrade may also refer to:
- a tuple of arity 4
- Tetrad, a group of four haploid and immature pollen grains in tetrahedral fashion produced by meiotic microsporogenesis
- Tetrad (area)
- Tetrad (astronomy), an occurrence of 4 total lunar eclipses in a row with intervals of 6 lunations (semester)
- Tetrad (chord)
- Tetrad (chromosomal formation)
- Tetrad (computing), a 4-bit group
- Tetrad (general relativity), a mathematical frame of reference in general relativity
- Tetrad (geometry puzzle)
- Tetrad (meiosis), the four cells produced by meiotic cell division
- Tetrad (music), a set of four notes
- Tetrad (symbol) or tetractys
- Tetrad formalism, a concept in differential geometry
See also
- Celsus tetrad, the four cardinal signs of inflammation
- Dark tetrad, group of four undesirable personality traits
- Pentad (disambiguation) ("group of 5")
- Tetrad of media effects, a pedagogical tool
- Tetromino, a shape composed of four squares
- Triad (disambiguation) ("group of 3")
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