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

    Format

      .DISPLAY APPENDIX  y

    Abreviated format

      .DAX  y