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@nxskok @skinnylatte I hope you really want to know, because I'm about to nerd out.

All RER trains have a 4 letter code. On line B, the first letter tells you what's the destination stop (E for CDG airport, K for Massy-Palaiseau, L for Orsay-Ville, etc). The second letters describes where the train stops (O is for omnibus). The last two letters are only here to make the code easy to pronounce and understand when transmitted over radio.

So LOUP is an omnibus train for Orsay-Ville :-)