code: function (legend, item) {
  		
  		item.legendSymbol = this.chart.renderer.rect(
  			0,
  			legend.baseline - 11,
  			legend.options.symbolWidth,
  			12,
  			2
  		).attr({
  			zIndex: 3
  		}).add(item.legendGroup);		
  		
  	}
docs: Get the series' symbol in the legend
  
  @param {Object} legend The legend object
  @param {Object} item The series (this) or point