IMO if kind of up to the person doing the chart... abc is usually for 3 waves abcde is usually for triangle i ii .... are sub waves look at this 90 minute chart from here <a href="http://www.yelnick.typepad.com/" target="_blank">http://www.yelnick.typepad.com/</a> he does not even lable the ending diagonal triange abcde lol but he does label the legs of the triange abc