Circuit nodes.
<ul><li>Original: Was made by <a href="https://en.wikipedia.org/wiki/User:Brianab86" class="extiw" title="en:User:Brianab86">Brianab86</a> at <a class="external text" href="https://en.wikipedia.org">en.wikipedia</a> in Paint</li>
<li>SVG: Was made by <a href="https://en.wikipedia.org/wiki/User:DnetSvg" class="extiw" title="en:User:DnetSvg">DnetSvg</a> at <a class="external text" href="https://en.wikipedia.org">en.wikipedia</a></li></ul>
SVG created by DnetSvg from the <a href="https://en.wikipedia.org/wiki/Image:Nodes2.jpg" class="extiw" title="en:Image:Nodes2.jpg">original image</a>