Red square with the number 86 in notification bar.

Welcome to the forums. What phone do you have? Can't you get more information about that icon if you expand the notification bar?
 
^ This. Expand notifications, and see what it corresponds to. This is how 99.9% of notifications work IME.

I'm guessing you installed a storage space notification widget, or have it enabled in a launcher or something.

Good call, Matthew, it does look like a MicroSD card. ;)
 

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