Polyominoes are shapes made from connecting unit squares together, though certain connections are not allowed.


A Domino

A domino is the shape made from attaching unit squares so that they share one full edge. The term polyomino is based on the word domino. There is only one possible domino.


A polymino made from three squares is called a tromino. There are only two possible trominoes.



A polymino made from four squares is called a tetromino. There are five possible combinations and two reflections:



A polymino made from five squares is called a pentomino. There are twelve possible pentominoes, excluding mirror images and rotations.