What does the series of circles in a schematic mean?
OK, I found an Eagle schematic file of this, and I checked the properties, like jwsc suggested. They seem to represent fiducials.  

Comment: fiducials don't belong on a schematic, they're purely PCB-related. You don't place mounting holes on a schematic either. When they appear on a schematic they will most likely show up in the BOM as well.