Interesting fact about the Bluetooth logo

An interesting background about the Bluetooth logo that we see almost every day - quoted from Wikipedia.

The word "Bluetooth" is an anglicized version of the Scandinavian Blåtand/Blåtann, the epithet of the tenth-century king Harald I of Denmark and parts of Norway who united dissonant Danish tribes into a single kingdom. The idea of this name was proposed by Jim Kardach who developed a system that would allow mobile phones to communicate with computers (at the time he was reading Frans Gunnar Bengtsson's historical novel The Long Ships about Vikings and king Harald Bluetooth). The implication is that Bluetooth does the same with communications protocols, uniting them into one universal standard

The Bluetooth logo is a bind rune merging the Younger Futhark runes  (Hagall) and  (Bjarkan), Harald's initials.

You can read more details about Bluetooth on Wikipedia or the official Bluetooth website as well.