A student center is a type of building found on university and some high school campuses. In the United States, such a building may also be called a student union, student commons, or union. The term "student union" refers most often in the United States to a building, while in other nations a "students' union" is the student government. Nevertheless, the Association of College Unions International has several hundred campus organizational members in the US; there is no sharp dichotomy in interpretation of union in this context. The US usage in reference to a location is simply a shortened form of student union building.