# Welcome to the Highcharts Gantt JS (gantt) Options Reference

These pages outline the chart configuration options, and the methods and properties of Highcharts objects.

Feel free to search this API through the search bar or the navigation tree in the sidebar.

# plotOptions.series.marker.symbol

A predefined shape or symbol for the marker. When undefined, the symbol is pulled from options.symbols. Other possible values are `'circle'`, `'square'`,`'diamond'`, `'triangle'` and `'triangle-down'`.

Additionally, the URL to a graphic can be given on this form: `'url(graphic.png)'`. Note that for the image to be applied to exported charts, its URL needs to be accessible by the export server.

Custom callbacks for symbol path generation can also be added to `Highcharts.SVGRenderer.prototype.symbols`. The callback is then used by its method name, as shown in the demo.