hypocycloid

noun

hy·po·cy·cloid ˌhī-pō-ˈsī-ˌklȯid

: a curve traced by a point on the circumference of a circle rolling internally on the circumference of a fixed circle

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And the helmet remains unique – while providing a callback to Pittsburgh's industrial history – with the trio of hypocycloids in the logo (which appears only the right side of the helmet) evoking the Steelmark symbol used by the American Iron and Steel Institute. —