Signature of Italian physicist <a href="https://en.wikipedia.org/wiki/Carlo_Rovelli" class="extiw" title="en:Carlo Rovelli">Carlo Rovelli</a>.
<a href="//commons.wikimedia.org/wiki/Category:Carlo_Rovelli" title="Category:Carlo Rovelli">Carlo Rovelli</a>
<span class="int-own-work" lang="en">Own work</span>