A double flat symbol.
<table class="licensetpl" style="display:none"><tbody><tr><td><span class="licensetpl_short">Public domain</span><span class="licensetpl_long">Public domain</span><span class="licensetpl_link_req">false</span><span class="licensetpl_attr_req">false</span>
</td></tr></tbody></table><table style="width:100%; clear:both; margin:0.5em auto; background-color:#f7f8ff; border:2px solid #8888aa; direction: ltr; border-spacing: 8px; padding: 0px;" class="layouttemplate mw-content-ltr" lang="en"><tbody><tr><td><span class="layouttemplateargs" style="display:none;speak:none;" title="template=PD-user-w 1%3D%3Aen%3A 2%3DEnglish+Wikipedia 3%3DKtims 4%3D 5%3D 6%3D 7%3D%5B%5B%3Aen%3AUser%3AKtims%7CKtims%5D%5D"> </span> <img alt="PD-icon.svg" src="https://upload.wikimedia.org/wikipedia/commons/thumb/6/62/PD-icon.svg/64px-PD-icon.svg.png" decoding="async" width="64" height="64" srcset="https://upload.wikimedia.org/wikipedia/commons/thumb/6/62/PD-icon.svg/96px-PD-icon.svg.png 1.5x, https://upload.wikimedia.org/wikipedia/commons/thumb/6/62/PD-icon.svg/128px-PD-icon.svg.png 2x" data-file-width="196" data-file-height="196"></td>
<td>This work has been released into the <b><a href="https://en.wikipedia.org/wiki/en:public_domain" class="extiw" title="w:en:public domain">public domain</a></b> by its author, <b><a href="https://en.wikipedia.org/wiki/User:Ktims" class="extiw" title="en:User:Ktims">Ktims</a> at the <a href="https://en.wikipedia.org/wiki/" class="extiw" title="en:"> Wikipedia</a> project</b>. This applies worldwide.<br><p><small>In case this is not legally possible:</small><br><a href="https://en.wikipedia.org/wiki/User:Ktims" class="extiw" title="en:User:Ktims">Ktims</a> grants anyone the right to use this work <b>for any purpose</b>, without any conditions, unless such conditions are required by law.
</p>
</td></tr></tbody></table>
<a class="external free" href="https://en.wikipedia.org/wiki/Image:Doubleflat.svg">http://en.wikipedia.org/wiki/Image:Doubleflat.svg</a>