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Comes up when I try to select multiple items with the selection tool, and I can't select more than one item at a time. I've been using Illustrator for forever and I have never seen this.
I've tried ungrouping, expanding the shapes—nothing. I don't know what the icon is even trying to indicate.
Please give us a bigger picture that also contains your objects and the situation on screen.
Also: which system is it and which version?
I do not think it is one of the default Illustrator icons. Do you have plug-ins or extensions installed?