still

n. In Pittsburghese, this is an alloy that consists mostly of iron ("ahn" in Pittsburghese) and has a carbon content between 0.2% and 2.1% by weight, depending on the grade. Carbon is the most common alloying material for iron, but various other alloying elements are used, such as manganese, chromium, vanadium, and tungsten. Varying the amount of alloying elements and the form of their presence in the still controls qualities such as the hardness, ductility, and tensile strength of the resulting alloy. While Pittsburgh is known colloquially as "The Still City" for its historical still manufacturing base, today its economy is largely based on health care, education, technology, robotics, and financial services. The region is also becoming a hub for oil and natural gas companies' Marcellus Shale production.