Start new paragraph. A paragraph
type can be specified,
overriding default. Various registers can be set to control
Paragraph type for document (default is 0).
Amount of indent (default is 3v).
Spacing between paragraphs (default is one line of white space).
Set this to 1 to produce numbered paragraphs.
Left-justified (the default)
Indented except after displays (.DE), lists (.LE), and headings (.H).