"hollow circle" is correct and usable in written English.
It can be used when referring to a shape that is circular in nature and has an empty or hollow area in its center. For example, "The design included a series of interconnected hollow circles."
Furthermore, hollow circle cube architecture is formed due to the decomposing of the carbonate.
It was Pick who oversaw the evolution of the underground roundel from a red blob with bar to a more elegant hollow circle with bar.
Both players are about the size of a pack of cigarettes, and both have their controls arrayed in a hollow circle below a liquid crystal display screen.
Figure 7 shows the relaxation behavior at HM = 0.99 HC (red hollow circle), 0.97 HC (blue hollow square), and 0.95 HC (green hollow diamond), for (a) ES1, and (b) ES2.
In the first two hours of her canvass along Hook Hollow Circle last Saturday, Ms. Ashbrook, 52, knocked on more than 25 doors, hanging flyers with the Kerry endorsement on doorknobs and saying she was doing an election survey.
But then workers would have substantially less safety, as with the hollow circle in Figure 2.
This resulted in fast moving objects appearing as streaks, while slow moving objects will appear as hollow circles, representing diffusive motion over time.
This structure is difficult to represent in a two-dimensional picture, but Figure 7A is a useful analogue with the hollow circles representing oxygen atoms and the small solid dots representing silicon atoms.
The hollow circles are average values over bins.
Hollow circles show all available EarthScope MT sites as of this writing.
Locations and relative size of aftershocks are shown by hollow circles from data of National Seismological Centre, Department of Mines and Geology.
