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
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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...