oQueue Icons

My apologies if the key to the many icons shown in oQueue is staring me in the face and I just can't see it.  Can someone please point me in the direction?  

I'm referring to the icon shown at the upper right, next to the class icon, upon mouseover of  players' names.  There is also a row of spaces for icons at the bottom of that same mouseover window.

Thanks in advance for your help!
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