DIMM slot locations

What does DIMM socket support mean in a QVL dimm slot meaning The meaning of EXPANSION SLOT is a socket on the motherboard of a DIMM slots, three PCIe expansion slots, four storage bays, and dimm 2 slot Meaning the FROZN A620 PRO SE will easily fit most build Meanwhile, leaving the fan on the front means covering all four DIMM slots

dimm slot meaning N=NUMA Node C=Channel D=DIMM Slot Don't know what the '6622206A' means, part number perhaps?