The <a href="https://en.wikipedia.org/wiki/Heawood_graph" class="extiw" title="en:Heawood graph">Heawood graph</a>, drawn with three crossings. Topologically this is the same embedding as the one in <a href="//commons.wikimedia.org/wiki/File:Heawood_graph_crossing_number.svg" title="File:Heawood graph crossing number.svg">File:Heawood graph crossing number.svg</a> but it shows some of the symmetries of the embedding more clearly.
<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>