The term 'PENN' can be broken down into four separate crossword solutions: IVY, AVE, STA, and STN. IVY is a reference to the IVY League, a group of eight prestigious universities in the United States, of which the University of Pennsylvania is a member. AVE stands for Avenue, which is a street name commonly used in Philadelphia, where the University of Pennsylvania is located. STA is an abbreviation for station, which is a reference to the 30th Street Station in Philadelphia, which is the main train station for the city. STN is an abbreviation for station, which is a reference to the Philadelphia International Airport, which is located close to the University of Pennsylvania.