A curve. It may have a more specific name in some circumstances - eg a circle or a parabola.
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A straight line is one which travels in exactly one direction, never bending or curving.
It has no Right angels because it has a curving line all around! Simples!
Closed spiral fracture
The croquet start line is called a baulk line.
This type of line usually indicates a spiral fracture, brought about by an excessive amount of torque applied along the axis of the bone.