The US Patent & Trademark Office has published Apple's sensory mark application 85609317 that uniquely represents the sound that's associated with turning on the iPhone's Siri feature. Apple's application states that the mark consists of a sound mark consisting of a rapid two-tone repetition for the note C#. Apple has filed their sensory mark under four International Classes to protect their mark. Some of what's covered in these classes includes computers, electronic devices, voice recognition, social networking, advertising and reservation systems for such matters as hotels and restaurants. Of course you could always use Siri to assist you with your dinner date or for just ordering in soup on a rainy day. Whatever you use it for, it all begins with Apple's two-tone sensory mark.