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Steelmark
The Steelmark is a logo representing steel and the steel industry owned by the American Iron and Steel Institute, and used by it to promote the product and its manufacturers.
The logo was incorporated as the emblem of the Pittsburgh Steelers, initially using the same design as the Steelmark, but later modified to include the team's full name.
==Description==
The Steelmark consists of three four-pointed starlike figures within a circle. The stars in the design approximate a type of geometric figure called an astroid, a particular type of hypocycloid with four cusps.〔("The Story Behind The Pittsburgh Steelers Logo" ), American Iron and Steel Institute, January 30, 2006. Accessed January 5, 2009.〕〔The original figures were most likely constructed with the help of French curves and a bit of artistic license, as the logo was designed decades before computer-aided graphics came into common use. The actual figures are somewhat more concave than mathematically true astroids.〕 A yellow figure is located at the top of the design, orange to the right and blue on the bottom, with the word "Steel" on the left side. The logo appears within a gray ring against a white background.
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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