@unnumberedsec, @appendixsec, @heading

The @unnumberedsec, @appendixsec, and @heading commands are, respectively, the unnumbered, appendix-like, and heading-like equivalents of the @section command. (See section @section.)

@unnumberedsec

The @unnumberedsec command may be used within an unnumbered chapter or within a regular chapter or appendix to provide an unnumbered section.

@appendixsec

@appendixsection

@appendixsection is a longer spelling of the @appendixsec command; the two are synonymous. Conventionally, the @appendixsec or @appendixsection command is used only within appendices.

@heading

You may use the @heading command anywhere you wish for a section-style heading that will not appear in the table of contents.