Variable: help-back-label
help-back-label is a variable defined in help-mode.el.gz.
Value
"[back]"
Documentation
Label to use by help-make-xrefs for the go-back reference.
Source Code
;; Defined in /usr/src/emacs/lisp/help-mode.el.gz
;; Grokking cross-reference information in doc strings and
;; hyperlinking it.
;; This may have some scope for extension and the same or something
;; similar should be done for widget doc strings, which currently use
;; another mechanism.
(defvar help-back-label "[back]"
"Label to use by `help-make-xrefs' for the go-back reference.")