I&#x27;ve typically seen that transliterated as &#x27;ss&#x27;.  For instance, see <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Schloss" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Schloss</a>