SLOT MACHINE definition and meaning

Part B Baseband Specification slot b Currently the keys B, M, A and E together with B+M and A+E are in use The slot and the module have to support the same key in order to be compatible slot 1 real In the picture above, I have a spare DDR4 DIMM B Ram slot on my Inspiron 15 3565

slot voor poort CFexpress Type B and SDXC UHS-II Dual-slot Card Reader USB Gen 2 $ USD or 4 interest-free payments of $ with