Bluetooth

A standard for Wireless PANs first devised by Ericsson, later standardized by the Bluetooth SIG. Bluetooth is a radio standard that operates in the license-free ISM band at 2.45 GHz. Designed for low power consumption, its reach is up to 10 meters (30 ft).

See definition from Personal Telco Wiki, http://www.personaltelco.net/index.cgi/BlueTooth

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Also see Harald Bluetooth, a Danish king.