- HTML5
(O)(O)- C
\u0028\u004F\u0029 (C99)\U000028\U00004F\U000029 (C99)\x28\x4F\x29 (encoding-dependent)\050\117\051 (encoding-dependent)- C++
\u{28}\u{4F}\u{29} (C++23)\x{28}\x{4F}\x{29} (C++23, encoding-dependent)\o{050}\o{117}\o{051} (C++23, encoding-dependent)\U00000028\U0000004F\U00000029\u0028\u004F\u0029\x28\x4F\x29 (encoding-dependent)\050\117\051 (encoding-dependent)- Java
\u0028\u004F\u0029- JavaScript
\u{28}\u{4F}\u{29}\u0028\u004F\u0029\x28\x4F\x29- CSS
\28\4F\29\000028\00004F\000029- Quoted-Printable
=28=4F=29- URL
%28%4F%29