Variable: gnus-empty-thread-mark
gnus-empty-thread-mark is a customizable variable defined in
gnus-sum.el.gz.
Value
32
Documentation
There is no thread under the article.
Source Code
;; Defined in /usr/src/emacs/lisp/gnus/gnus-sum.el.gz
(defcustom gnus-empty-thread-mark ? ;Whitespace
"There is no thread under the article."
:group 'gnus-summary-marks
:type 'character)