Can you identify this 'N' app running in the status bar? This 'N' thing in the status bar is new and I don't know which app it is. I've looked in the applications list but can't find anything unusual. I think it also changed the wallpaper without asking.

Does anyone recognize it?

Here it is close up:



And in the context of the screen:
I don't know for sure, but could it be a variation of the NFC status icon?