XLFD  X Logical Font Description
This font naming convention is intended to allow for the unique naming
of fonts of any style, resolution, and size. It is powerful but
unwieldy.

Ex.

adobe-courier-bold-o-normal--10-100-75-75-m-60-hp-roman8

specifies a courier, bold, oblique bitmapped font created by
Adobe. The font is 10 pixels tall, 100 tenths of a point tall on a
75dpi*75dpi display. Characters are monospaced, and are an average of
60 tenths of a pixel wide. Fonts codes are based on the HP Roman8
encoding.



14 Fields:

Foundry		Exs: Adobe, B&H, Bitstream    max:21 chars
FamilyName	Exs: Charter, Courier, Helvetica, New Century
		Schoolbook, Symbol, Times     max:26 chars
WeightName	Exs: Medium, bold    max:8 chars
Slant		Exs: Roman (r), Italic (i), Oblique (o)    1 char
SetwidthName	Exs: normal, condensed, double width, compressed, expanded
		max: 13 chars
AddStyleName    max: 9 chars
PixelSize
PointSize	measured in tenths of a point (decipoints)
ResolutionX	horizontal resolution of the device that the font was designed for, measured in pixels-per-inch.
ResolutionY	vertical resolution  ...
Spacing		Exs.m (monospace, ie. fixed-width) or p (proportional,ie. variable-width).  max: 2 chars
AverageWidth	Mean width of all characters in the font, measured in tenths of a pixel
CharSetRegistry Exs. iso8859, hp, ascii, koi8   max: 13 chars
CharSetEncoding  max: 12 chars



Type is normally measured in points, a printer's unit equal to 1/72 of
an inch. The size of a font in pixels depends on the resolution of the
display font in pixels. For example, if the display font has 100-dpi
resolution, a 12-point font will have a pixel size of 17, while with
75-dpi resolution, a 12-point font will have a pixel size of 12. If
the PixelSize, PointSize and AverageWidth are all zero, it is a
scalable font.



http://www.meretrx.com/e93/docs/xlfd.html
http://www.x.org/X11R6.8.1/doc/XLFD/xlfd.pdf