insert-rectangle

insert-rectangle is an autoloaded compiled Lisp function in `rect.el'.

(insert-rectangle RECTANGLE)

Insert text of RECTANGLE with upper left corner at point.
RECTANGLE's first line is inserted at point, its second
line is inserted at a point vertically under point, etc.
RECTANGLE should be a list of strings.
After this command, the mark is at the upper left corner
and point is at the lower right corner.