Use this formula for the SmartIcon:
@Command([TextSetFontFace]; "Symbol"); @Command([TextSetFontSize]; "10"); @Command([TextSetFontColor]; [Red]); @Command([EditInsertText]; "?"); @Command([TextNormal]); @Command([TextSetFontFace]; "Helv"); @Command([TextSetFontColor]; [Black]); @Command([EditInsertText]; " ")