Resident Assistant was what they were called when I went to college (many moons ago.) They were an older student “in charge” of a dorm floor.
When I was in college, an R/A was a graduate student who looked over the floor of a dorm, in exchange for pay or rent.
In my first dorm, that was a 25 year old Special Forces non-com just back from beautiful Southeast Asia, this being in the very early '70s.
Needless to say, not much ever happened on his floor.