Don't know much about geometry
By 2nd grade you should have been taught that the Steelers Logo is made up of 3 hypocycloids. Yet, if you actually look it up, there are lots of hypocycloids. For example, this is accurately described as a hypocycloid: the deltoid, or this unnamed 'oid'. Hypocycloids one and all. None of those shapes will be caught on the side of any neomodern Steelers logo. To just describe them as hypocycloids is a lot less precise than just saying they are 3 diamond-like shapes of different colors.
The logo the Steelers use has 3 shapes that are one particular type of hypocycloid. Ready for this?
They're Tetracuspids, also known colloquially as Astroids.
want more.... here is the optional reading.
* McKinley being