Set or query the bitmap used by the window manager for the window’s icon. bitmap names a bitmap in one of the standard forms accepted by Tk; an empty string cancels the current icon bitmap. With no argument, return the name of the current icon bitmap, or an empty string. On Windows the default argument names an icon (for example an .ico file) applied to all top-level windows that have no icon of their own. wm_iconbitmap() is an alias of iconbitmap().