http://dining.umd.edu/plans/where-to-use-your-points/
While the dining plan has been “updated” since my son first enrolled as a freshman, the biggest difference I recall was that the dining plan funds (while offering a “discount”) could not be carried over to the next semester but Terrapin Express could and any balance at end of year could either be refunded or carried over (not sure why I think they were called Terp bucks at the time?).
http://dining.umd.edu/plans/terrapin-express/