What does a star mean beside the 4G symbol on a Droid Turbo?

[AC Question]

I have had my Droid Turbo almost a year. Today a star appeared beside the 3G/4G symbol on the top line of the phone. Can someone tell me what it is? I have not added any apps, nor did I manipulate the settings in my phone in at least a month.

 

[sydneycooper1979]

I think this indicates that only priority notifications will come through. Like a do not disturb feature