<a href="https://en.wikipedia.org/wiki/ambigram" class="extiw" title="en:ambigram">Ambigram</a> <b><a href="https://en.wikipedia.org/wiki/Upside_Down" class="extiw" title="en:Upside Down">upside down</a></b>. 180° rotational symmetry. <a href="https://en.wikipedia.org/wiki/Recursion" class="extiw" title="en:Recursion">Recursive</a> sentence, talking about itself. Black on white text logo with gray looping arrow symbol. Animated GIF.
<a href="//commons.wikimedia.org/wiki/User:Basile_Morin" title="User:Basile Morin">Basile Morin</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>