The <a href="https://en.wikipedia.org/wiki/Rod_of_Asclepius" class="extiw" title="en:Rod of Asclepius">rod of Asclepius</a> as depicted in the WHO logo.
WHO
<p>Extracted from the WHO logo: <a href="//commons.wikimedia.org/wiki/File:Flag_of_WHO.svg" title="File:Flag of WHO.svg">File:Flag of WHO.svg</a>
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<a rel="nofollow" class="external free" href="http://www.who.int/about/licensing/emblem/en/">http://www.who.int/about/licensing/emblem/en/</a>