
Harold Bluetooth ruled as the King of Denmark and Norway in the 10th Century. The Nordic runes of his initials (H+B, (ᚼ, Hagall) and (ᛒ, Bjarkan)) are combined to form the Bluetooth icon.
It's interesting to note that this was only designed as a temporary thing, with a more descriptive name (like short-distance WiFi?) but became permanent later.
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