Variable: ediff-control-buffer-number
ediff-control-buffer-number is a buffer-local variable defined in
ediff-init.el.gz.
Documentation
Same as ediff-control-buffer-suffix, but without "<,>".
It's a number rather than string.
Source Code
;; Defined in /usr/src/emacs/lisp/vc/ediff-init.el.gz
(ediff-defvar-local ediff-control-buffer-number nil
"Same as `ediff-control-buffer-suffix', but without \"<,>\".
It's a number rather than string.")