The Bluetooth Runestone in Lund: from a Viking king to the standard powering modern wireless
Inside the side museum of Lunds Domkyrka, the cathedral of Lund, sits a small stone roughly a metre high. The runes carved on it date to around AD 985 and are attributed to the then king of Denmark, Harald "Bluetooth" Gormsson. The stone is one of the smaller but historically richer archaeological objects of the late first millennium, because the person it names is a figure in not only Scandinavian history but also the modern naming of technology.
Lund today lies in Sweden's Skåne region, about 18 km northeast of Malmö. In the 10th century, however, the area was under Danish rule; it was the eastern frontier of the kingdom built by Harald Bluetooth's father Gorm the Old and his mother Thyra Dannebod. As historians suggest, the stone probably commemorates one of Harald's military campaigns or a ceremonial procession. The exact translation of the runes is still debated; the most widely accepted academic reading is "Toke, Harald's man, raised this stone."
Harald's nickname "Bluetooth" appears as "Blåtand" in contemporary Scandinavian texts and has been variously interpreted as the consequence of dental decay or of a personal habit (a love of blueberries, for instance). Some historians have argued the nickname is a political metaphor: blue, in medieval Scandinavian symbolism, was a colour associated with leadership or dominion. Harald's historical importance lies in his conversion of Denmark to Christianity (around AD 965), his unification of the Danish and Norwegian kingdoms, and a series of major construction projects (the round military forts at Trelleborg, for example).
In 1998, engineers at Ericsson's Sweden office were looking for a name for a new industry standard for short-range wireless communication. A conversation between Sven Mattisson and Jim Kardach (of Intel) settled it. By Kardach's own account, he was at the time reading Frans G. Bengtsson's Viking novel "Röde Orm" (The Long Ships), and the figure of Harald Bluetooth inspired him: "Bluetooth, like Harald uniting kingdoms, was a technology that would unite different communication devices," he said, proposing the name as a temporary code.
The "Bluetooth" name was made permanent in May 1998 in the founding documents of the industry consortium, the Bluetooth Special Interest Group (SIG). The corporate logo, too, was a Scandinavian symbol: a ligature formed by combining the Anglo-Saxon runes "H" (Hagall) and "B" (Berkanan), the initials of Harald's name in the Latin alphabet. This ligature became one of the most widely used symbols in the world.
The stone at Lund has also become something of a modern pilgrimage site. According to Atlas Obscura's Lund guide, the stone receives an average of 12,000 visitors a year — engineers, software developers and technology students. In 2024, the Bluetooth SIG ran a joint fundraising campaign with the Lunds Domkyrka museum; the €240,000 raised was used to modernise the museum's technology-history section.
The last word on the stone's academic study belongs to Professor Bjørn Asgaard of the Scandinavian Studies department at Lund University. In an interview with BBC History Magazine, Asgaard noted that the stone is quickly associated with a wider Scandinavian rune family: "The Lund stone establishes a reference link with the larger Jelling stone; it is part of a semi-standardised tradition of stone-carving that radiated across Harald's kingdom." Asgaard records that the runes on the Lund stone are around 22 centimetres tall, slightly shorter than the average runic height of the period.
Lund itself is a medieval university town. The University of Lund was founded in 1666 and, with 27,000 registered students, is one of the oldest in Scandinavia. The museum that holds the Bluetooth Runestone is part of the university's historic building complex. For students at Lund, the stone is an off-curriculum reference point; it is also the source of jokes among faculty that "Lund sits at the centre of the history of technology."
This particular link between technology and history has also been echoed in global popular culture. In Microsoft's 2009 video game Halo 3 ODST, the main character's radio callsign was "Bluetooth"; the writers said the choice was a nod to Harald Bluetooth. In the Disney+ series Vikings: Valhalla, released in 2023, the role of Harald Bluetooth was given to the Swedish actor Ola Rapace.
The stone at Lund represents to visitors an important fragment of medieval Scandinavian history while also pointing to the symbolic origins of the 21st century's most widespread communication technology. The Atlas Obscura guide notes the sentence on the information panel beside the stone: "Harald united his kingdoms. A millennium later, his name unites our devices." That sentence sums up the short stop travellers make at Lund's historic site.