My store is a Super T and we still have this signing. We really only use the colors to differentiate between the doors (Blue Doors or Green Doors) for TMs to unlock at store open, do carryouts, etc. or to specify which side of the checklanes we need backup on.
We rarely use the terms "Blue World" and "Green World," and never say "Red World" for anything
Blue = Electronics, MMB, Cards & Party, Home Office, Home Improvement, Automotive, Seasonal (Blocks A, B, C)
Green = Mini-Seasonal, H&B, Cosmetics, Housewares, Home Storage, Home Decor, Cleaning Supplies (Blocks E and F)
Red = Furniture, Domestics, Toys, Sporting Goods (Block D)
Dry Grocery and Meat/Dairy/Frozen are all technically on the "Green Side" and Softlines all has Blue signing, but these are their own areas.