Professor Wobbrock says it uses a large circular cursor instead of the traditional arrow pointer.

VOA: special.2011.04.18

Because of their circular movement, these severe windstorms are also known as twisters.

VOA: special.2009.06.09

Because of their circular movement, these windstorms are also known as twisters.

VOA: special.2011.04.19

They were placed one on top of another in a circular shape.

VOA: special.2011.05.18

It is a circular image with many layers of flying birds.

VOA: special.2009.09.02