groff: Indentation values in ms

 
 4.3.5.5 Indentation values
 ..........................
 
 In many situations, you may need to indentation a section of text while
 still wrapping and filling.  SeeLists in ms, for an example of
 nested lists.
 
  -- Macro: .RS
  -- Macro: .RE
      These macros begin and end an indented section.  The 'PI' register
      controls the amount of indentation, allowing the indented text to
      line up under hanging and indented paragraphs.
 
    Seems Displays and Keeps, for macros to indentation and turn off
 filling.