All Uru Ages have a four-letter prefix used to identify them. The game itself usually ignores those, but it's mostly a commodity to avoid potential name clashes and to better organize the game's assets. NB01 for instance stands for NeighBorhood01 (all the Bevin-based hoods - also, the "Private Room" is actually the neighborhood's "egg room", since it's intended for private conversations). ISLM stands for ISLandMain (aka Ae'Gura, which is the main island on the D'ni lake and was referred to as "The Island" by the D'ni themselves). You should have a look at the DAT folder, since usually files in this folder contain both the Age name and its four-letter identifier (for instance, Gahreesen's files are named Garrison_District_grsnSomething.prp).
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