a stage in which the audience can see all angles. There are no walls.
Dane Cook's vicious circle was an arena stage.
a combination of a rectangle and an oval. Rectangle with round edges.
Can also be used to describe the action of going around in a rectangle, since it is more mathematically correct than circling when in fact is not a circle, but instead of making 90 degrees angles you can curve and it would be a roval.
Are we rovaling today?