A <a href="https://en.wikipedia.org/wiki/Trefoil_knot" class="extiw" title="en:Trefoil knot">trefoil knot</a>, drawn with <a href="https://en.wikipedia.org/wiki/Bridge_number" class="extiw" title="en:Bridge number">bridge number</a> 2
<a href="//commons.wikimedia.org/wiki/User:David_Eppstein" class="mw-redirect" title="User:David Eppstein">David Eppstein</a>
<span class="int-own-work" lang="en">Own work</span>