Squadron roundel of <a href="https://en.wikipedia.org/wiki/No._20_Squadron_RAF" class="extiw" title="w:No. 20 Squadron RAF">No. 20 Squadron Royal Air Force</a> created in Inkscape
<a href="//commons.wikimedia.org/wiki/User:De728631" title="User:De728631">De728631</a>
<span class="int-own-work" lang="en">Own work</span>