What is m2_1 and m2_2 storages?

m2_1 slot
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INSTALL NVMe SSD IN NO OR SINGLE SLOT MOTHERBOARD

M2_1 slot supports 2242 2260 2280 22110 storage devices- M2_2 slot supports 2242 2260 2280 storage devices- Intel Optane Memory Ready for all slots

glücksburg slot Is this OK or should I move the standoff from M2_2 to M2_1 and install the HDD in M2_1? slot but it is not shown in that picture it is

mystery motel slot 詳しくは商品詳細を確認下さい。 16+2+2 デジタル Twin 電源フェーズ設計 PCIe UD Slot 2 スロット (M2_1、Key M、type 22602280 SSD対応、ヒートシンク付き(取り外し