Tetromino

Well, Tetromino...what do we have here?

 

A tetromino, also spelled tetramino or tetrimino, is a geometric shape composed of four squares, connected orthogonally. This is a particular type of polyomino, like dominoes and pentominoes are. 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. However, the spelling of the word used by The Tetris Company differs slightly by replacing the first 'o' with an 'i' to make the word Tetrimino.

Source: Wikipedia

Click here to play.