<a href="https://en.wikipedia.org/wiki/Coxeter-Dynkin_diagram" class="extiw" title="en:Coxeter-Dynkin diagram">en:Coxeter-Dynkin diagram</a> blank space symbol (narrow) Compare to wider <a href="//commons.wikimedia.org/wiki/File:CDel_2.png" title="File:CDel 2.png">File:CDel 2.png</a>
self
<span class="int-own-work" lang="en">Own work</span>