Hypocycloid prove that an epicycloid with "k" cusps moves snugly inside one with "k"+1 cusps. The evolute of a hypocycloid is an enlarged version of the hypocycloid itself, while the involute of a hypocycloid is a reduced copy of itself. The pedal of a hypocycloid with pole at the center of the hypocycloid is a rose curve. The isoptic of a hypocycloid is a hypocycloid. 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).
Toy soldier material, but the most common mass-produced varieties are metal and plastic. There are many different kinds of toy soldiers, including tin soldiers or "flats", hollow cast metal figures, composition figures, and plastic army men. Metal toy soldiers were traditionally sold in sets; plastic figures were sold in toy shops individually in Britain and Europe and in large boxed sets in the U.S. Modern, collectable figures are often sold individually. Scale for toy soldiers is expressed as the soldier's approximate height from head to foot in millimeters. Because many figures do not stand up straight, height is usually an approximation. Standard