The .DISPLAY CHAPTER command allows you to specify the form that
    the numbering (or lettering) of chapters will take. The form you
    specify appears in the title, the page numbers, and the first
    character of header level numbers throughout the chapter. This
    command does not change any values; it affects only the way the
    values are displayed. (See also .CHAPTER and .NUMBER CHAPTER.)

    Format

      .DISPLAY CHAPTER  y

    Abreviated format

      .DCH  y