What does the number in the AddChart2 VBA macro represent?

Question

I\'ve use my Excel 2013 to record a macro in inserting a chart, a column-clustered chart in my case. In the view code option, it shows me a line of code as below:

Answer 1

One can also provide only the ChartType and the application will use the default style.

Set oShp = ActiveSheet.Shapes.AddChart2(XlChartType:=xl3DColumnClustered)
oShp.Chart.SetSourceData Source:=RngDta

This picture shows the default ChartStyle for all ChartTypes (excluding StockHLC and StockVOHLC)