Bluetooth is a wireless technology standard used for exchanging data between fixed and mobile devices over short distances using UHF radio waves in the industrial, scientific and medical radio bands, from 2.402 GHz to 2.480 GHz, and building personal area networks. It was originally conceived as a wireless alternative to RS-232 data cables.
The name “Bluetooth” was proposed in 1997 by Jim Kardach of Intel, who developed a system that would allow mobile phones to communicate with computers. At the time of this proposal, he was reading Frans G. Bengtsson's historical novel The Long Ships about Vikings and the 10th-century Danish King Harald Bluetooth.
Bluetooth is the Anglicised version of the Scandinavian Blatand/Blatann. It was the epithet of King Harald Bluetooth who united dissonant Danish tribes into a single kingdom. The implication being that Bluetooth unites communication protocols.
The Bluetooth logo is a bind rune merging the Younger Futhark runes Runic letters, Harald's initials.