Definition of "Officer" in myUMBC Groups

I'm trying to use myUMBC groups a little more.  So far I find the things you can do with myUMBC groups useful.  I have a question that I was hoping someone could help me out with.  I may have missed this when searching for the answer throughout myUMBC Groups, but what does the check box of "Officer" signify when assigned to a group member?

Thanks,
Steve