picture-clear-rectangle
picture-clear-rectangle is an interactive compiled Lisp function in `picture.el
'.
(picture-clear-rectangle START END &optional KILLP)
Clear and save rectangle delineated by point and mark.
The rectangle is saved for yanking by M-x picture-yank-rectangle and replaced
with whitespace. The previously saved rectangle, if any, is lost. With
prefix argument, the rectangle is actually killed, shifting remaining text.