Variable: view-overlay
view-overlay is a buffer-local variable defined in view.el.gz.
Documentation
Overlay used to display where a search operation found its match.
This is local in each buffer, once it is used.
Source Code
;; Defined in /usr/src/emacs/lisp/view.el.gz
(defvar-local view-overlay nil
"Overlay used to display where a search operation found its match.
This is local in each buffer, once it is used.")