Markers are symbols used to identify the individual data values i.e. the point of intersection of an X and Y coordinate on a chart. Markers can only be used with Area, Line and XYScatter charts. The following symbols can be used as markers:

• Circle
• Square
• Triangle
• Diamond
• Plus
• Cross
• Dash
• Asterisk

 The below code shows how to add marker to the series in a line chart:

[Java]  
     DateTimeLineSeries lineSeries = new DateTimeLineSeries("Series name");
     Marker marker = Marker.getCircle(2);
     lineSeries.setMarker(marker);

Note: Markers can also be added from the series constructors.