Why is Bluetooth named after a Viking king? The story behind the technology

Bluetooth is a familiar part of everyday life, helping people connect their phones to headphones, speakers, cars and other devices without wires. But the technology’s unusual name has little to do with modern gadgets. Its origins go back more than 1,000 years to a Viking king who ruled Denmark. The story behind the name also explains why the technology’s logo looks unlike most modern tech symbols.

Who was Harald Bluetooth, the Viking king?