From the steel workers.
See related link to Pittsburgh Steelers official website.
The Steelers began using their current logo in 1962.
The logo for the Pittsburgh Steelers is a circle with 'Steelers' on the right side and three diamonds to the North, East, and South of it. The colors in the order listed previously are yellow, red, and blue.
It was based on the logo used by U.S. Steel in the 1960s.
PGH is a common abbreviation for Pittsburgh, PA.
412 is the area code of Pittsburgh, Pennsylvania.
The Steeler logo is only featured on one side of the helmet.
One can purchase Pittsburgh Steelers jerseys when one goes to NFL shops. The shops have NFL team jerseys with logo and design of Pittsburgh Steelers on them. Price starts from $100.
They are called Hypocycloids. It is the Steelmark logo.