This is a list of hillside letters (also known as mountain monograms) in the U.S. state of Arizona. There are at least 63 hillside letters, acronyms, and messages in the state, possibly more. Arizona's most notable monograms are likely the pair of A's for Arizona State University and the University of Arizona that are a focus of their rivalry. Arizona also has a fictional monogram, the RS for Radiator Springs in the movie Cars. References External links Mountain Monograms, a website explaining the origins and with an incomplete list and pictures Hillside Letters, a companion website to a book on the subject Letters on Hills, a category on waymarking.com for geocachers Arizona Arizona geography-related lists Lists of public art in the United States