A polyomino is a plane geometric figure formed by joining one or more equal squares edge to edge. It is a polyform whose cells are squares. It may be regarded as a finite subset of the regular square tiling with a connected interior. Polyominoes are classified according to how many cells they have: Polyominoes have been used in popular puzzles sin...
Found on
http://en.wikipedia.org/wiki/Polyomino
(from the article `number game`) The term polyomino was introduced in 1953 as a jocular extension of the word domino. A polyomino is a simply connected set of equal-sized squares, ...
Found on
http://www.britannica.com/eb/a-z/p/91
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