I found this useful fiddle about how to use FontAwesome as markers in HighChart. The idea is to use the icons' unicode to plug in HighChart.
marker: {
symbol: 'text:\uf0c8',
},
However in FontAwesome, both solid and regular versions of the same shape share the same unicode. For example, solid square and regular square. If I use their unicode, the HighChart marker is always the solid version. How do I change the marker to the regular version?
In that fiddle, it is using font-awesome 4.1.0, so if you want to use the regular square it should be:
marker: {
symbol: 'text:\uf096',
},