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Tetromino
Four squares connected edge-to-edge / From Wikipedia, the free encyclopedia
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A tetromino is a geometric shape composed of four squares, connected orthogonally (i.e. at the edges and not the corners).[1][2] Tetrominoes, like dominoes and pentominoes, are a particular type of polyomino. The corresponding polycube, called a tetracube, is a geometric shape composed of four cubes connected orthogonally.
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/5/50/All_5_free_tetrominoes.svg/200px-All_5_free_tetrominoes.svg.png)
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/9/9c/Typical_Tetris_Game.svg/220px-Typical_Tetris_Game.svg.png)
A popular use of tetrominoes is in the video game Tetris created by the Soviet game designer Alexey Pajitnov, which refers to them as tetriminos.[3] The tetrominoes used in the game are specifically the one-sided tetrominoes.