Military Flail a.k.a Morning Star
<a href="https://en.wikipedia.org/wiki/User:Mysid" class="extiw" title="w:User:Mysid">Mysid</a> (SVG), <a href="https://en.wikipedia.org/wiki/User:MathKnight" class="extiw" title="en:User:MathKnight">MathKnight</a> (original).
Attribution
Vectors created by <a href="https://en.wikipedia.org/wiki/User:Mysid" class="extiw" title="w:User:Mysid">Mysid</a> in Inkscape; based on <a href="//commons.wikimedia.org/wiki/File:Flail01.png" title="File:Flail01.png">Image:Flail01.png</a> originally by <a href="https://en.wikipedia.org/wiki/User:MathKnight" class="extiw" title="en:User:MathKnight">en:User:MathKnight</a>.