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. ⇒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.