Variable: allout-numbered-bullet
allout-numbered-bullet is a customizable and buffer-local variable
defined in allout.el.gz.
Documentation
String designating bullet of topics that have auto-numbering; nil for none.
Topics having this bullet have automatic maintenance of a sibling sequence-number tacked on, just after the bullet. Conventionally set to "#", you can set it to a bullet of your choice. A nil value disables numbering maintenance.
Source Code
;; Defined in /usr/src/emacs/lisp/allout.el.gz
;;;_ = allout-numbered-bullet
(defcustom allout-numbered-bullet "#"
"String designating bullet of topics that have auto-numbering; nil for none.
Topics having this bullet have automatic maintenance of a sibling
sequence-number tacked on, just after the bullet. Conventionally set
to \"#\", you can set it to a bullet of your choice. A nil value
disables numbering maintenance."
:type '(choice (const nil) string)
:group 'allout)