@top command is a special sectioning command that you
should only use after an ‘@node Top’ line at the beginning of a
Texinfo file. The
@top command tells the
formatter which node is to be used as the root of the node tree
(needed if your manual uses implicit node pointers).
It produces the same sort of output as
(see @unnumbered @appendix).
@top node is conventionally wrapped in an
@ifnottex conditional so that it will not appear in TeX
output (see Conditionals).
Thus, in practice, a Top node usually looks like this:
@ifnottex @node Top @top your-manual-title very-high-level-summary @end ifnottex
@top is ignored when raising or lowering sections. That is,
it is never lowered and nothing can be raised to it
(see Raise/lower sections).