The team's success in this era led to the expansion of its fanbase beyond its geographic region. Today, Pittsburgh remains among the league leaders in merchandise sales, and draws fans from across the country to its games. This loyal fan following is sometimes called "Steeler Nation" (predating the similarly popular '70s powerhouse, the Oakland Raiders "Raider Nation") of a Nation: Capturing The Identity of a Region. byline, John Mehno, the term was coined by NFL Films as the producers studied the phenomenon of fans swarming Three Rivers from all directions and pronounced them the 'Steeler Nation'. They are known for employing the "terrible towel" (a bright yellow cloth) as its unofficial symbol (created by Myron Cope), and as a rallying sign during Steelers' games.