RHA meaning in Academic & Science ?

In the United States, a residence halls association (RHA) is a student-run university residence hall organization that is usually (but not always) the parent organization for individual hall governments. Their function is similar to a student government, except that most of their activities pertain to on-campus living. Most RHAs are a division of their student governments — however, a few are independent and equal or greater. Many residence hall associations were created at campuses across the US in the early twentieth century. RHA is the largest student-run organization of its kind in the world.