I am sorry, those are programming languages whose name has one letter.<p>For a true one-letter programming language please check SuperPython <a href="http:&#x2F;&#x2F;search.cpan.org&#x2F;~mjd&#x2F;SuperPython-0.91&#x2F;SuperPython.pm" rel="nofollow">http:&#x2F;&#x2F;search.cpan.org&#x2F;~mjd&#x2F;SuperPython-0.91&#x2F;SuperPython.pm</a>.