Short answers, pulled from the story.
The Pittsburgh Steelers were founded by Art Rooney, who was awarded an NFL franchise in May 1933 for a fee of $2,500. The team began play that season as the Pittsburgh Pirates at Forbes Field and was renamed the Steelers before the 1940 season.
The Pittsburgh Steelers have won six Super Bowls, tying them with the New England Patriots for the most in NFL history. Their championships came in Super Bowls IX, X, XIII, XIV, XL, and XLIII, spanning from 1974 to 2008.
The Immaculate Reception occurred during the 1972 playoffs when Franco Harris caught a deflected pass and returned it for a game-winning touchdown against the Oakland Raiders, securing the Steelers' first postseason victory in franchise history. The play is widely cited as one of the greatest in NFL history and marked the beginning of the franchise's rise to prominence.
The Steel Curtain was the nickname for the Steelers' dominant defensive unit of the 1970s, anchored along the defensive line by Joe Greene, L.C. Greenwood, Ernie Holmes, and Dwight White, with linebackers Jack Lambert, Jack Ham, and Andy Russell. The unit was known for its physicality, discipline, and relentless pass rush, and helped the team win four Super Bowls between 1974 and 1979.
The Rooney Rule is an NFL policy requiring that at least one minority candidate receive an interview in every head coaching hiring process. It was championed by Steelers owner Dan Rooney in the early 2000s and is named after him.
The Terrible Towel is a fan symbol conceived by Steelers broadcaster Myron Cope in 1975, described by the Associated Press as arguably the best-known fan symbol of any major professional sports team. The rights to the towel were given to the Allegheny Valley School in Coraopolis, Pennsylvania, which cares for over 900 people with intellectual and physical disabilities; since 1996, proceeds have raised more than $2.5 million for the school.