INSTINCT 2X TACTICAL: UNKNOWN SYMBOL/ICON

Hello,

I have been able figure out all of the icons on this watch so far except one.  I was hoping to get a little bit of help here.  On the lower left hand side of the watch is a data field with a circle like symbol next to "1121".  If someone could please tell me what this symbol/data field mean, I would appreciate it.

Thanks!

Mike