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"What television does is rent us friends and relatives who are quite satisfactory. This is quite something, to rent artificial friends and relatives right inside the house."
- Kurt Vonnegut, Jr.

Tongueprint Verification  
  A device that verifies the unique print of the tongue against a a database for identification purposes.  

You may not use your tongue for routine tasks involving machinery, but Puppeteers do.

Nearing a public stepping disc embedded in the walkway, [Nike] dipped a head into a pocket. With nimble lip nodes he retrieved an address from his personal transport controller; his tongueprint authorized access to a secured file. The disc flicked him instantly to a restricted location: the employee vestibule of the foreign affairs ministry.
Technovelgy from Fleet of Worlds, by Larry Niven (w/E.M. Lerner).
Published by Tor in 2007
Additional resources -

For those of you unfamiliar with Pierson's Puppeteers, they have two heads at the end of long, flexible necks that serve the same purpose as hands do for humans. The lips are knobbly and the tongue can also be used to make selections.

See also the entry for stepping disc.

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Additional resources:
  More Ideas and Technology from Fleet of Worlds
  More Ideas and Technology by Larry Niven (w/E.M. Lerner)
  Tech news articles related to Fleet of Worlds
  Tech news articles related to works by Larry Niven (w/E.M. Lerner)

Tongueprint Verification-related news articles:
  - Steering Wheel Finger Vein Authentication

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ID-U Biometrics Eye Tracking Signature

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