picture-yank-rectangle
picture-yank-rectangle is an interactive compiled Lisp function in `picture.el
'.
(picture-yank-rectangle &optional INSERTP)
Overlay rectangle saved by M-x picture-clear-rectangle
The rectangle is positioned with upper left corner at point, overwriting
existing text. With prefix argument, the rectangle is inserted instead,
shifting existing text. Leaves mark at one corner of rectangle and
point at the other (diagonally opposed) corner.