A dart board because they look like concentric circles and concentric circles look like circles with a center words like swirly could describe...
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A concentric circle.
concentric
Concentric circles, are circles within circles. Each concentric circle on the surface of a disk represents a track, the narrower the circle is, the more data can be stored on the disk.
Non concentric circles are circles that do not share the same center point.
The use of concentric circles is most commonly used on a target. Concentric circles are placed around a target in which each concentric circle has the same center.