Variable: tool-bar-style

Tool bar style to use.
It can be one of
image - show images only
text - show text only
both - show both, text below image
both-horiz - show text to the right of the image
text-image-horiz - show text to the left of the image
any other - use system default or image if no system default.

This variable only affects the GTK+ toolkit version of Emacs.