After a while those acronyms become a second language!
DCL - Disney Cruise Line
DVC - Disney Vacation Club
Here's a great list by Disney Dad Bret.
In addition, most of the WDW hotels have acronyms. Here are a few examples:
BC - Beach Club
AKL Animal Kingdom Lodge
PC - Pop Century
POFQ - Port Orleans French Quarter
If you google, "wdw acronym" or "disney acronym", you'll find some helpful websites including the ones mentioned by Bret in the link above. For example, wdwmagic.com has a list of acronyms beginning with AA for the American Adventure and ending with YC for Yacht Club.
Disney Mom Erin also helps
decipher some of this WDW language.
Before long, you'll be asking to book an ADR at the WL's WCC. Decoded that would be an Advance Dining Reservation at the Wilderness Lodge's Whispering Canyon Cafe.