IEEE sign at Arecibo observatory
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/20086101@N00">Chris Amelung</a>
CC BY 2.0
<a href="//commons.wikimedia.org/wiki/Flickr" class="mw-redirect" title="Flickr">Flickr</a>: <a rel="nofollow" class="external text" href="https://www.flickr.com/photos/20086101@N00/4791727141">Arecibo Observatory</a>