tan·gram /ˈtæŋgrəm, ˈtæn-/
七巧板
Tan·gram 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.
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tangram
n : a Chinese puzzle consisting of a square divided into seven
pieces that must be arranged to match particular designs