Tangram n. : A Chinese toy made by cutting a square of thin wood, or other suitable material, into seven pieces, as shown in the cut, these pieces being capable of combination in various ways, so as to form a great number of different figures. It is now often used in primary schools as a means of instruction.

Example:
How many polygons are in a Tangram?

Taxonomy
tangrams, puzzle, history, picture, tangram set, Tangram puzzles, software, paradox, shape, design, game, ancient Chinese puzzle, Ancient Chinese, piece puzzle, Mother of Pearl, vir, tangra, Dudeney.

Defination from the web:
Tangrams, an ancient Chinese puzzle, consisting of seven geometrical pieces that forms thousands of designs. ... Learn its history, make your own tangram set or try solving one of the puzzle shapes. We have great downloads of printouts and software for you to play with. ...