Tetromino

A tetromino, is a polyomino made of four square blocks. The seven one-sided tetrominoes are I, O, T, S, Z, J, and L.

The spelling "tetromino" is standard among mathematicians. The Tetris Company had preferred tetramino around 1999 and has used tetrimino since 2001.

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External links

• Mathworld
• Wikipedia:Tetromino
• The Tetris Taxonomy: The Pieces (Adult audience)