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A general (not necessarily regular) tetrahedron, defined as a convex polyhedron consisting of four (not necessarily identical) triangular faces can be specified by its polyhedron vertices as , where , ..., 4. Then the volume of the tetrahedron is given by.
It is a group of four things, like cells, spores, anything biological. I would recommend looking at Wikipedia for more examples. . A tetrad is a group of four. It may refer to: Tetrad (chromosomal formation) Tetrad (genetics), the four spores of a yeast; Tetrad (general relativity), a mathematical frame of reference in general relativity; Tetrad (index notation), a concept in differential geometry; Tetrad (music), a set of four notes; Tetrad (symbol) or tetractys; Tetrad (unit of area) Tetrad, a group of four haploid and immature pollen grains in tetrahedral fashion produced by meiotic microsporogenesis Tetrad (astronomy), an occurrence of 4 total lunar eclipses in a row with intervals of 6 lunations .