[Solved]-Highcharts change symbol and hover text of individual points Line Chart-Highcharts

Solved using this code.

var chart = new Highcharts.Chart({
chart: {
    renderTo: 'container',
    defaultSeriesType: 'line'
},
series: [{
    data: [{x:1.0,y:209.9,marker: {symbol: 'url(http://www.highcharts.com/demo/gfx/sun.png)'}}, {x:4.0,y:71.5}]
}]
});