Weird icon on notification bar Any ideas as to what it is?
Its not a notification or an ongoing notification. 
Samsung Galaxy Note 10.1 running Android 4.1.2
I have just had the same question answered on another forum:  Its a notification from Greenify: opening Greenify showed that auto-hibernation was not currently working.  Greenify need to ensure that a notification is linked to the appearnace of the icon.

If you do not have Greenify installed then the mystery deepens...