Pentomino |
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A Pentomino is a shape formed by 5 equal squares joined by edges.
There are 12 possible pentominoes (ignoring transformations)
Many puzzles and games use the pentomino pieces including tiling of rectangles and other simple shapes.
http://www.scholastic.com/blueballiett/games/pentominoes_game.htm
Making the pentominoes from cubes leads to a wider class of puzzles including space filling.
http://mathworld.wolfram.com/Pentomino.html
http://en.wikipedia.org/wiki/Pentominoes