This is the logo of HTM.
<a href="//commons.wikimedia.org/wiki/User:Wgabrie" title="User:Wgabrie">Wgabrie</a>
2011-12-06
<span class="int-own-work" lang="en">Own work</span>. Based on PNG image: <a href="https://upload.wikimedia.org/wikipedia/commons/8/80/Logo_HTM.jpg" class="internal" title="Logo HTM.jpg">Media:Logo_HTM.jpg</a>.