An annulus
<a href="https://en.wikipedia.org/wiki/User:Waltpohl" class="extiw" title="w:User:Waltpohl">Waltpohl</a> SVG: <a href="//commons.wikimedia.org/wiki/User:Doodledoo" title="User:Doodledoo">Doodledoo</a> 22:20, 23 July 2007 (UTC)
July 1, 2006 - svg July 23, 2007
<a class="external autonumber" href="https://en.wikipedia.org/wiki/Image:Annulus.png">[1]</a>