If you're softlines it probably is tables. One of my TLs discovered she can put labels on things and we'll see ZN, CRT, RCK, etc. Chances are you can ask your FRO tomorrow (operator) and they'll know. If you are not softlines, I have no clue. lol
For us (and remember ASANTS and all that jazz): CRT = carts... it means you're to be pushing carts from the truck; RCK = racks... it means you're to be pushing racks from the truck; ZN = zone... it means you should be taking care of the zone and doing go backs/reshop; PLN = plano... it means you're setting pogs.... she has another one she uses but I can't remember it off the top of my head.