Polyabolo
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In recreational mathematics, a polyabolo (also known as polytan) is a polyform with a right isosceles triangle as the base form.
The name is a back formation from 'diabolo' although the shape formed by joining two triangles at just one vertex is not a proper polyabolo.
There is one monabolo, three diaboloes, four triaboloes and 14 tetraboloes.Template:Math-stub