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https://superuser.com/questions/1449499/why-does-linux-list-nvme-drives-as-dev-nvme0-instead-of-dev-sda#1449520
In short; sd stands for SCSI Disk and SSD and USB all use the SCSI protocol. While SD-cards/emmc (flash-on-CPU) are named emmcblkpX for emmc block device, partition X. And NVME have additionally namespaces, which is the nX part.
sd
emmcblkpX
nX
So, EMMC is even worse