There are a set of icons, which could be used by Set(icons ...) command:

Icon	Name	Icon	Name	Icon	Name	Icon	Name	Icon	Name
	bookmark		click_icon		configure		default		down
	exit		edit		exec		file		fileclose
	fileexport		find		fit		folder		forward
	fullscreen		hash		info		kill		launch
	minimize		minus		mute		next		no
	ok		pause		play		plus		previous
	question		rewind		refresh		star		stop
	unmute		up		view_text		view_tree		vol_down
	vol_up