for the "Web" book is about hinting a font. Ok, so you're
yourself, "what the hang is hinting?" Very briefly, it
is the process of
instructions to a font so it will know how to rasterize each character
different sizes. This is most important on computer monitors where
resolution can really make a font look like do-do. Read the book
for more info.
This is my favorite
of the bunch, so naturally they didn't use it.