This is the official manual for the latest Org-mode release.
The Texinfo export back-end recognizes these indexing keywords if used in the
#+VINDEX. The back-end also recognizes custom
index definitions that use raw Texinfo code in the Org file (see Quoting Texinfo code).
#+CINDEX: Defining indexing entries
For the back-end to generate an index entry for a headline, set the
:INDEX: property to ‘cp’ or ‘vr’. These abbreviations come
from Texinfo that stand for concept index and variable index. The Texinfo
manual has abbreviations for all other kinds of indexes. The back-end
exports the headline as an unnumbered chapter or section command, and then
inserts the index after its contents.
* Concept Index :PROPERTIES: :INDEX: cp :END: