My phone has an icon I can't identify.  It's under the date and time.  There's a numeral 1 and next to that is a little white circle on top of a yellow  symbol that is a horizontal line with vertical line attached line, going towards the right at about a 45 degree angle.

I didn't have that icon for the first few days of the phone and now it's on constant.  Simultaneously, I've had less battery life since that icon showed.  

Anyone recognize my description?