Hello rohit9133,
Thanks for contacting us again!
I'd suggest refactoring your
series.data to the array of objects and simply passing the
id property to each as a representation of a
key that will be helpful for assigning proper icon. Then inside the
formatter you can easily take use of it by reference to the particular point. I've updated your demo, take a look:
http://jsfiddle.net/BlackLabel/ptckfa6m/.
As you can see, I've created a simple object for better icons map at the top but it's totally up to you how you reference them.
Let me know if that was what you were looking for,
Kind Regards!