Tetrad
293698
219401987
2008-06-15T01:38:50Z
Damian Yerrick
1
Early manuals for [[Tetris]] called tetrominoes "tetrads"
{{wiktionary|tetrad}}
'''Tetrad''' may refer to:
* [[Tetrad (chromosomal formation)]], a chromosomal formation in meiosis
* [[Tetrad (general relativity)]], a mathematical frame of reference in general relativity
* [[Tetrad (genetics)]], the four spores of a yeast
* [[Tetrad (Greek philosophy)]], the first number formed by the addition and multiplication of equals
* [[Tetrad (index notation)]], a concept in differential geometry
* [[Tetrad (music)]], a set of four notes
* [[Tetrad (unit of area)]], an area 2km x 2km square
* [[Tetromino]], a shape composed of four squares
* [[Tetrad of media effects]], a pedagogical tool
{{disambig}}