See TextFormatter
Wikipedia: http://en.wikipedia.org/wiki/Nroff Family: MarkupLanguage Platform: Unix License: Commercial
UNIX markup language. Incidentally, 'man' pages on UNIX are formatted using nroff and the 'an' macro package.
[ROFF Man Page] [troff/nroff quick reference] [Creating and Formatting Man Pages]
See also troff for typesetting.