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jamiehttp://en.wikipedia.org/wiki/Common_Room_(university)
[edit] Harvard
At Harvard College, the term "Junior Common Room" officially refers to the collection of undergraduates affiliated with one of Harvard's 13 houses. Every undergraduate is assigned to a house in the spring of his or her freshman year and thereafter is a member of that house's Junior Common Room, including students who have chosen to reside off campus.
In everyday usage, however, "Junior Common Room" almost always refers to a large common room in an undergraduate house by the same name, or simply "JCR" for short. JCRs are generally available for undergraduates to study or watch television, and student groups often reserve the space for meetings. This is in contrast to a "Senior Common Room," or SCR, which is for exclusive use of members of the houses' Senior Common Room members, which includes the House Masters and other accomplished academics in the community.