tool-bar-mode
tool-bar-mode is an interactive compiled Lisp function in `tool-bar.el
'.
(tool-bar-mode &optional ARG)
Toggle the tool bar in all graphical frames (Tool Bar mode).
With a prefix argument ARG, enable Tool Bar mode if ARG is
positive, and disable it otherwise. If called from Lisp, enable
Tool Bar mode if ARG is omitted or nil.
See `tool-bar-add-item' and `tool-bar-add-item-from-menu' for
conveniently adding tool bar items.