Bluetooth technology is named after Harald Bluetooth, whose initials in runic script — ᚼᛒ — make up the logo.

FIRST KING OF THE DANES

The Bluetooth name is an Anglicized version of the Scandinavian word Blåtand, sometimes spelled Blåtann. In Old Norse it's Blátǫnn. The word is the epithet of the tenth-century king Harald Bluetooth who united dissonant Danish tribes into a single kingdom and, according to legend, introduced Christianity. The Bluetooth logo is a combination of Harald's initials, using what are called the Hagall (ᚼ) and Bjarkan (ᛒ) characters.

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