When installing Debian 9.3, the partition part of the install shows a table like
SCSI3 (0,0,0) (sdc) - 160.0 GB ATA HDDNAME
> #1 primary 524.3 MB B ext4
> #2 primary 159.5 GB K lvm
What do the flags mean? "B" indicates a boot partition, but I've also seen "K", "F", and "f", with no indication anywhere I can find of what these are supposed to mean.