They're filesystem labels. /dev/disk/by-label gets populated by udev [0]. The labels can be set with "e2label", "btrfs filesystem label", or other tools dependi

They're filesystem labels. /dev/disk/by-label gets populated by udev [0]. The labels can be set with "e2label", "btrfs filesystem label", or other tools depending on the filesystem type. [0] https://github.com/systemd/systemd/blob/master/rules.d/60-persistent-storage.rules#L117 https://github.com/systemd/systemd/blob/master/rules.d/60-pe...