My Store

"Steelmark" is a steel trademark owned by the American Iron and Steel Institute (AISI) that was officially introduced in 1959. The logo features three diamond shapes within a circle; the three colors represent the three key steelmaking raw materials—coal, iron ore, and scrap steel—symbolizing high-quality North American steel. Later adapted under license, it became the classic emblem of the Pittsburgh Steelers football team. It serves as both an industry identifier and an iconic symbol of Pittsburgh's steel culture, and its use requires official authorization.