Unless you join as a member and share a screenshot we can't possibly tell you. What I CAN tell you is that if you pull down the notification shade the symbol (if it appears at the left of the status/notification bar) will correspond to one of those notifications.
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@mustang7757 I wouldn't have guessed those 3 (unless you were showing how wildly off we can be without even a description), I would have guessed 3rd row, next to last column, or one that's not there that looks similar but has a + in the center.