Passengers vetted via background checks would have a biometric identifier, such as their fingerprint or iris pattern, in their passport or other travel document.

BBC: New measures in airport security

The social networking site has used another copyright filtering program called Audible Magic since February to pick out copyrighted videos based on their "digital fingerprint, " a pattern of pitches in the video's audio track.

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The electronic nose is an array of nano-scale gas sensors--the maximized surface area of the nano-particles allows the most gas to pass over them--along with pattern recognition technology that can create a digital fingerprint (or noseprint, as the case may be) of specific smells.

FORBES: Magazine Article

The pattern, Rousseau says, is as distinctive as a fingerprint.

FORBES: Portfolio

Rather than using a passcode or swipe pattern to unlock the phone's screen, the new handset's fingerprint sensor allows users to simply press and slide a finger across a switch to quickly unlock it.

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