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"FingerIO is an impressive mobile sonar technology, developed by a group of scientists over at the University of Washington, that is designed to make it possible to transform mobile devices into high-tech sonar systems by using futuristic finger movement-tracking technology.  The technology works by transmitting sound waves from speakers that bounce off the user&amp;#039;s finger as they&amp;#039;re moving it on a surface or on mid-air, with the resulting echoes being detected by a pair of microphones. By figuring out the amount of time that passes between the release of the waves and the receipt of their echoes, the finger&amp;#039;s position can be calculated highly accurately.  This mobile sonar conversion technology could have a wide variety of applications and could be used in consumer electronics such as smartphones and music players."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.trendhunter.com/trends/mobile-sonar>