## 5.11 The ‘subsub’ Commands

The fourth and lowest level sectioning commands in Texinfo are the ‘subsub’ commands. They are:

`@subsubsection`

  Subsubsections are to subsections as subsections are to sections. (See section `@subsection`.) In a printed manual, subsubsection titles appear in the table of contents and are numbered four levels deep.

`@unnumberedsubsubsec`

  Unnumbered subsubsection titles appear in the table of contents of a printed manual, but lack numbers. Otherwise, unnumbered subsubsections are the same as subsubsections. In Info, unnumbered subsubsections look exactly like ordinary subsubsections.

`@appendixsubsubsec`

  Conventionally, appendix commands are used only for appendices and are lettered and numbered appropriately in a printed manual. They also appear in the table of contents. In Info, appendix subsubsections look exactly like ordinary subsubsections.

`@subsubheading`

  The `@subsubheading` command may be used anywhere that you need a small heading that will not appear in the table of contents. In Info, subsubheadings look exactly like ordinary subsubsection headings.

In Info, ‘subsub’ titles are underlined with periods. For example,

    @subsubsection This is a subsubsection

produces

    This is a subsubsection
    .......................

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