If you use a smartphone, wireless speaker or even headphones, you’ve probably enabled Bluetooth. But have you ever thought about the origin of this surprising name? And why does the logo for this wireless communication technology have this shape? Discover the surprising anecdote behind this term that has become a must-have.
A name inspired by a Viking king: Harald Blåtand
The history of the word ” Bluetooth ” dates back to the 10th century, well before the invention of mobile phones. The name refers to Harald I of Denmark, nicknamed ” Blåtand ” in Old Norse, which means ” blue tooth ” suggesting that he either had rotten teeth or a strong liking for blueberries, which stain the tongue and teeth.
Harald Blåtand was a Viking king famous for unifying the Danish tribes under a single kingdom. This name perfectly symbolises the mission of Bluetooth technology: to bring together different devices and communication systems under a single standard, just as Harald unified several territories.

When technology meets history
In the 1990s, a number of technology companies were working on wireless communication solutions. Among them, Ericsson, Intel and Nokia were looking for a way to standardise the connection between electronic devices.
It was Jim Kardach, an Intel engineer, who suggested the name ” Bluetooth “ at a meeting. One of his counterparts at Ericsson had told him about Harald Blåtand after reading a book about this sovereign. Jim Kardach thought the analogy was perfect: just as the Viking king united people, their technology would unite different devices.
The origin of the Bluetooth logo
Originally, ” Bluetooth ” was supposed to be a provisional name until a more official term was found. However, the name caught on and eventually stuck. The Bluetooth logo itself is a tribute to Harald Blåtand: it combines his initials in runic alphabet: ” Hagall ” (Ḥ) and ” Bjarkan ” (Ḃ).

An original anecdote
The anecdote of the origin of the word ” Bluetooth ” is much more than a curiosity: it illustrates how history and technology intertwine in surprising ways. The name, chosen almost by accident, has become a global symbol of interconnection.
The next time you turn on the Bluetooth on your device, you might think of Harald “Blue Tooth” and how ancient history continues to influence our modern world.
What’s certain is that you’ll have an exciting Viking story to tell at the next dinner party!
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