texinfo: @unnumbered @appendix

Chapter Structuring

@majorheading @chapheading

@chapter

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5.4 '@unnumbered', '@appendix': Chapters with Other Labeling
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Use the '@unnumbered' command to start a chapter-level element that
appears without chapter numbers of any kind.  Use the '@appendix'
command to start an appendix that is labeled by letter ('A', 'B', ...)
instead of by number; appendices are also at the chapter level of
structuring.

  Write an '@appendix' or '@unnumbered' command at the beginning of a
line and follow it on the same line by the title, just as with
'@chapter'.

  Texinfo also provides a command '@centerchap', which is analogous to
'@unnumbered', but centers its argument in the printed and HTML outputs.
This kind of stylistic choice is not usually offered by Texinfo.