HP PCL 5 - Pitch; Height

EN Pitch 7-5
Pitch
Pitch describes the number of characters printed in a horizontal inch.
Pitch only applies to fixed-spaced fonts, since the number of
characters per inch varies for proportional fonts.
Figure 7-5 Pitch
Height
The height of a font is the measurement of the body of the type in
PCL points. A PCL point is 1/72 inch in bitmap fonts, and
approximately 1/72 inch in scalable fonts. The body of the type is
slightly larger than the distance from the bottom of a descender to the
top of an unaccented capital letter.
Figure 7-6 Height
This loose measure from near the bottom of a descender to just
above the top of an unaccented capital letter is sometimes referred to
as the “Em.”