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It's commonly used. Ex-Penn State for the school.
The Nittany Lions
Penn State's nickname is the Nittany Lions. There is a range of ridges in the Appalachian Mountains not far from the Penn State campus called Nittany Mountain. There used to be mountain lions that roamed that range.
Pennsylvania means "Penn's woods".
The nickname of the United States is US or USA.
Penn Hills is a municipality, formerly a township, in Allegheny County, Pennsylvania, United States. It gets its name from William Penn.
USA Its a "nickname" for United States of America
the United States' nickname is America