B stands for refrigerator

C stands for refrigeration

D stands for freezing

BCD stands for refrigerator with refrigeration function.

fridge

BC/BD freezer with refrigeration function

As you said, SD/SC and SCD LSC can also belong to freezers.

All this means what kind of refrigeration and freezing methods are available.

Like Haier and LC, this represents the ice bar series. I don't know what you want with these. It should not matter if you want to buy it! ~