Variable: flyspell-mode-line-string
flyspell-mode-line-string is a customizable variable defined in
flyspell.el.gz.
Value
" Fly"
Documentation
String displayed on the mode line when flyspell is active.
Set this to nil if you don't want a mode line indicator.
Source Code
;; Defined in /usr/src/emacs/lisp/textmodes/flyspell.el.gz
(defcustom flyspell-mode-line-string " Fly"
"String displayed on the mode line when flyspell is active.
Set this to nil if you don't want a mode line indicator."
:type '(choice string (const :tag "None" nil)))