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polyabolo
In recreational mathematics, a polyabolo (also known as a polytan) is a polyform with an isosceles right triangle as the base form.
==Nomenclature==
The name ''polyabolo'' is a back formation from the juggling object 'diabolo', although the shape formed by joining two triangles at just one vertex is not a proper polyabolo. By false analogy, treating the di- in diabolo as meaning "two", polyaboloes with from 1 to 10 cells are called respectively monaboloes, diaboloes, triaboloes, tetraboloes, pentaboloes, hexaboloes, heptaboloes, octaboloes, enneaboloes, and decaboloes.
The name ''polytan'' is derived from Henri Picciotto's name ''tetratan'' and alludes to the ancient Chinese amusement of tangrams.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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