pentomino

A pentomino is a Polyomino composed of five congruent squares, connected along their edges (which sometimes is said to be an orthogonal connection).There are 12 different free pentominoes.html" target="_blank">Pentominoes, often named after the letters of the Latin alphabet that they vaguely resemble. Ordinarily, the pentomino obtained by reflection or rotation of a pentomino does not count as a different pentomino.Pentomino