Logos and uniforms of the Pittsburgh Steelers "Steagles"; the team's colors at that time were green and white as a result of wearing Eagles uniforms. These are the colors of the city's official flag which are the colors of the city's namesake Sir William Pitt. The colors black and gold are also representative of the two ingredients to create steel, coal and iron ore. Originally, the team wore gold colored helmets and black jerseys. Unique to Pittsburgh, the Steelers' black and gold colors are now shared by all major professional teams in the city, including the Pittsburgh Pirates in baseball and the Pittsburgh Penguins in ice hockey.
Ice hockey in the United States restricted to protect junior players' college eligibility). The Frozen Four is college hockey's national championship. Summer senior ice hockey is increasing in popularity in the 21st century, with Edina, Minnesota's Da Beauty League and Buffalo, New York's Fattey Hockey League both drawing NHL players who use the leagues to stay in shape during the offseason. Da Beauty League, established in 2016, is considered the nation's premier summer ice hockey league and benefits from corporate sponsorship from the Minnesota business community. A hockey tournament debuted in the summer Olympics in 1920. It would later be called the first World Ice Hockey