*

Geometry. A curve defined in the Cartesian plane with the equation y2(y2 − a2) = x2(x2 − b2).

Studied heavily by Gabriel Cramer, the name comes from the juggling game "diabolo" involving two sticks, string, and a spinning prop resembling this curve. And in Italian, "diabolo" also means 'devil'.

Who's Viewing? Customers in Sunnyvale, Texas, Oak Lawn, Illinois and Estacada, Oregon, USA.

Thinker Clothing™