A tetromino is a geometric shape composed of four squares, connected orthogonally. This, like dominoes and pentominoes, is a particular type of polyomino. The corresponding polycube, called a tetracube, is a geometric shape composed of four cubes connected orthogonally. A popular use of tetrominoes is in the video game Tetris, where they have been...
Found on
http://en.wikipedia.org/wiki/Tetromino
A four-square polyomino.
Found on
http://www.daviddarling.info/encyclopedia/T/tetromino.html
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