Ruth Asawa's San Francisco fountain in Union Square. According to <a href="//commons.wikimedia.org/wiki/File:Ruth_Asawa%27s_San_Francisco_fountain_plaque.JPG" title="File:Ruth Asawa's San Francisco fountain plaque.JPG">the nearby plaque</a>, the "HH" represents the Grand Hyatt on Union Square.
<a href="//commons.wikimedia.org/wiki/User:BrokenSphere" title="User:BrokenSphere">BrokenSphere</a>
CC BY 3.0
<span class="int-own-work" lang="en">Own work</span>