URI: 

       README - 9base - revived minimalist port of Plan 9 userland to Unix
  HTML git clone git://git.suckless.org/9base
   DIR Log
   DIR Files
   DIR Refs
   DIR README
   DIR LICENSE
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       README (635B)
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            1 Postscript definitions for special troff characters. File names are
            2 the two character troff names. Each defines a PostScript procedure
            3 that begins with build_ and ends with the character's name. The
            4 build_?? procedure is called with the character width as it's only
            5 argument. The .map files contain extra character data (e.g. image
            6 data) that dpost downloads immediately after the build_?? call,
            7 if the character's font table code field is 2 (rather than 1).
            8 
            9 The following PostScript variables are available:
           10 
           11         font                current font
           12         ptsize                current point size
           13         size                actual font size - scaled up from ptsize
           14 
           15 Don't overuse this stuff!
           16