It's the location service icon which is displayed there, go to setting> location services> and see in the list of application there which one of those apps are using the location services, you can chose to turn them off or leave them on.
It's the location service icon which is displayed there, go to setting> location services> and see in the list of application there which one of those apps are using the location services, you can chose to turn them off or leave them on.