Invented in 1975 by then Steelers radio broadcaster Myron Cope, the Terrible Towel has stood the test of time as one of the NFL's most versatile and iconic fan symbols. Whether they're waving them in the air or wiping down their seats with them, Steelers fans are never without their Terrible Towels. SI.com proudly presents the best shots of Steeler Nation with their Terrible Towels from the 2010-11 season.