"BUS" symbol, violet version with correct color of the <a href="https://en.wikipedia.org/wiki/Berliner_Verkehrsbetriebe" class="extiw" title="en:Berliner Verkehrsbetriebe">en:Berliner_Verkehrsbetriebe</a> design.
Unknown author<span style="display: none;">Unknown author</span>
Revised version of <a href="//commons.wikimedia.org/wiki/File:BUS-Logo.svg" title="File:BUS-Logo.svg">Image:BUS-Logo.svg</a>.