Follow-up Comment #2, bug #37686 (project texinfo):
that ^H^@[...] stuff is actually documented in the manual, search for the
literal string "^H^@" (not control characters) and you will see (there is a
little more in the CVS texinfo.txi than in 4.13).
Anyway, it is currently only used for two things: 1) images, and 2) as a
marker that "this is an index node" (ie, with @printindex output). This was
added so index-search could unambiguously know which nodes to search. I guess
standalone info could/should also use this. (Whether it was ever actually used
as intended in emacs info, I do not know.) But it's way less important than
the image stuff.
Thanks Sergey.
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