groff: Man font macros

 
 4.1.3 Macros to set fonts
 -------------------------
 
 The standard font is roman; the default text size is 10 point.  If
 command line option '-rS=N' is given, use Npt as the default text size.
 
  -- Macro: .SM [text]
      Set the text on the same line or the text on the next line in a
      font that is one point size smaller than the default font.
 
  -- Macro: .SB [text]
      Set the text on the same line or the text on the next line in bold
      face font, one point size smaller than the default font.
 
  -- Macro: .BI text
      Set its arguments alternately in bold face and italic, without a
      space between the arguments.  Thus,
 
           .BI this "word and" that
 
      produces "thisword andthat" with "this" and "that" in bold face,
      and "word and" in italics.
 
  -- Macro: .IB text
      Set its arguments alternately in italic and bold face, without a
      space between the arguments.
 
  -- Macro: .RI text
      Set its arguments alternately in roman and italic, without a space
      between the arguments.
 
  -- Macro: .IR text
      Set its arguments alternately in italic and roman, without a space
      between the arguments.
 
  -- Macro: .BR text
      Set its arguments alternately in bold face and roman, without a
      space between the arguments.
 
  -- Macro: .RB text
      Set its arguments alternately in roman and bold face, without a
      space between the arguments.
 
  -- Macro: .B [text]
      Set TEXT in bold face.  If no text is present on the line where the
      macro is called, then the text of the next line appears in bold
      face.
 
  -- Macro: .I [text]
      Set TEXT in italic.  If no text is present on the line where the
      macro is called, then the text of the next line appears in italic.