texinfo: @unnumberedsubsec @appendixsubsec @subheading

Chapter Structuring

@subsubsection

@subsection

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5.9 The '@subsection'-like Commands
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The '@unnumberedsubsec', '@appendixsubsec', and '@subheading' commands
are, respectively, the unnumbered, appendix-like, and heading-like
equivalents of the '@subsection' command.  (Note: @subsection.)

  '@unnumberedsubsec' and '@appendixsubsec' do not need to be used in
ordinary circumstances, because '@subsection' may also be used within
sections of '@unnumbered' and '@appendix' chapters (Note: @section).

  An '@subheading' command produces a heading like that of a subsection
except that it is not numbered and does not appear in the table of
contents.  Similarly, an '@unnumberedsubsec' command produces an
unnumbered heading like that of a subsection and an '@appendixsubsec'
command produces a subsection-like heading labeled with a letter and
numbers; both of these commands produce headings that appear in the
table of contents.  In Info and plain text, the '@subsection'-like
commands generate a title underlined with hyphens.