font - Bitmap Font File format
The .font file format stores bitmap fonts in SerenityOS's own binary format.
These files contain bitmap definitions of fonts, either varying-width or fixed-width.
The first four bytes contain the filemagic: !Fnt
(0x21466e74).
Gfx::FontFileHeader
in Userland/Libraries/LibGfx/Font/BitmapFont.cpp
.