PFF2 is a bitmap font format invented for the GNU GRUB 2 bootloader. It is an IFF-like format.
"PFF" stands for "PUPA Font Format"; PUPA was an experimental project which later developed into GRUB 2.
PFF version 1 was never widely used and was only ever suitable for containing GNU Unifont; it did not support arbitrary font geometries.
PFF2 files begin with
"FILE" 00 00 00 04 "PFF2".