groff: Indentation values in ms

 
 4.3.5.5 Indentation values
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 In many situations, you may need to indentation a section of text while
 still wrapping and filling.  ⇒Lists 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.
 
    ⇒ms Displays and Keeps, for macros to indentation and turn off
 filling.