Polyominoes are often named by a Latin letter that resembles the shape of the polyomino.
5 blocks make a pentomino (or pentimino), featured in Daedalian Opus seen in Tetris 2 + Bombliss and Puyo Puyo Tetris (only I).
4 blocks make a tetromino (or tetramino or tetrimino), featured in all versions of Tetris and most clones.
3 blocks make a tromino (or trimino or triomino): featured in Columns (fixed I only) and Pac-Attack (L only) seen in Tetris Blast and Tetris Party (I, L) and Puyo Pop Fever (L only).
Mario and Puyo Pop seen in Tetris Blast and Tetris Party.
2 blocks make a domino: (or dimino) featured in Dr.
1 block makes a monomino (or monamino or monimino).
A fixed polyomino can only be translated.
A one-sided polyomino is one that may be translated or rotated.
A free polyomino is one that may be translated (moved about), rotated, or reflected.
A polyomino is a piece made of two or more square blocks, where all blocks are connected through full coincident edges (as if squares on graph paper).