High Quality Content by WIKIPEDIA articles! In geometry, a hypocycloid is a special plane curve generated by the trace of a fixed point on a small circle that rolls within a larger circle. It is comparable to the cycloid but instead of the circle rolling along a line, it rolls within a circle. Curves similar to hypocyloids can be drawn with the Spirograph toy. Specifically, the Spirograph can draw hypotrochoids and epitrochoids. The Pittsburgh Steelers' logo, which is based on the Steelmark, includes three astroids (hypocycloids of four cusps). In his weekly NFL.com column Tuesday Morning Quarterback, Gregg Easterbrook, often refers to the Steelers as the Hypocycloids. The flag of Portland, Oregon features an astroid, a hypocycloid of four cusps. The 2007 redesign of The Price is Right's set features astroids on the three main doors and the turntable area.

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