Ring-like.
In Geometry it could possibly be a torus (plural tori).
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A torus is a doughnut shape. There is a picture and an enormous amount of information at http://en.wikipedia.org/wiki/Torus .
A sphere with two slices cut out of it by planes. A torus (doughnut) with a chunk taken out of it.
A cylinder, a semi-torus (half a doughnut).
It is called a megagon. A ∞ sided shape is called an apeirogon.
The 22 sided shape is called a: ICOSIKAIDIGON