they used black
The helmet is solid black with a gold central stripe and small white player numbers on the forehead. Last names were added to the jerseys in 1970, as part of a new NFL mandate resulting from the AFL-NFL merger (the AFL teams had last names on the back of their jerseys). In 1997, the team switched to rounded numbers on the jersey to match the number font (Futura Condensed) on the helmets, and a Steelers logo was added to the left side of the jersey.
what font pittsburgh pirates use
Shadow black consend is the highest based font used for the Philadelpha Eagles jerseys
There are many different fonts used for different teams. There is no standardised font for numbers or names. However, there are examples of fonts in the "Related Links" section