Hillside letters or mountain monograms are a form of geoglyph (more specifically hill figures) common in the Western United States, consisting of large single letters, abbreviations, or messages emblazoned on hillsides, typically created and maintained by schools or towns. There are approximately 500 of these geoglyphs, ranging in size from a few feet to hundreds of feet tall. They form an important part of the western cultural landscape, where they function as symbols of school pride and civic identity, similar to water towers and town slogans on highway "welcome to" signs in other regions.