The little blue symbol on your phone is over a thousand years old: two interlocking runes – the initials of the Viking king Harald Bluetooth, who once united Denmark. The story behind it is genuinely documented, and lovelier than you'd think.
Who Was Harald Bluetooth?
Harald Gormsson (Old Norse Haraldr Blátǫnn), son of King Gorm the Old and Queen Thyra, ruled Denmark from about 958 to 985/86. He completed the unification of the realm, at times ruled parts of Norway too, and introduced Christianity as the royal religion. In the end he was overthrown by his own son, Sweyn Forkbeard, and died soon after.
Where Does the “Bluetooth” Come From?
Honestly: nobody knows for sure. The epithet is first recorded only around 150 years after Harald's death (in the Chronicle of Roskilde, c. 1140). The most popular reading – that Harald had a dead, dark-stained (“blue”) tooth – is plausible but unproven. Linguistically, Old Norse blá- could also mean “dark/black”, which is why some think of dark hair or a dark complexion; another thesis derives the name from Old English “thane” (retainer). In short: a lovely by-name, an uncertain origin.
The Jelling Stones – Denmark's “Baptismal Certificate”
Around the year 965 Harald had a huge runestone raised at Jelling in memory of his parents. It bears the oldest depiction of Christ in Scandinavia and names the country “Denmark” – which is why it is often called Denmark's “birth or baptismal certificate”. Since 1994 the stones, mounds and church of Jelling have been a UNESCO World Heritage Site.
“King Harald ordered this monument made in memory of Gorm, his father, and in memory of Thyra, his mother; that Harald who won for himself all of Denmark and Norway and made the Danes Christian.”Inscription of the large Jelling stone, translation after the National Museum of Denmark
The large Jelling stone (c. 965), Denmark – UNESCO World Heritage. Photo: public domain (CC0), via Wikimedia Commons.
Monument and propaganda at once. “Made the Danes Christian” is Harald's own self-portrayal. In reality Christianisation was a longer process: as early as 826 the Danish king Harald Klak had been baptised in Mainz with more than 400 followers, and metal-detector finds show Christian influence long before Harald's “official” change of religion. The stone is thus also a powerful message of power.
A King Who Connected – with Rampart and Bridge
Harald was a master of the power statement. Under him arose the geometrically precise Trelleborg ring fortresses (Trelleborg, Fyrkat, Aggersborg, Nonnebakken; a fifth, Borgring, was confirmed in 2014) – dated by dendrochronology to c. 975–980, some built in a single winter season. Add to that the nearly 760-metre Ravning bridge (c. 985) and the extension of the border rampart Danevirke. Anyone who builds like that can coordinate a whole realm.
From King to Wireless Technology
Now the punchline. In 1996/97 Intel, Ericsson and Nokia were looking for a common standard so that devices from different makers could “talk” to each other wirelessly. The Intel engineer Jim Kardach had heard Scandinavian history from a colleague on a trip – from the historical novel “The Long Ships” by Frans G. Bengtsson, in which Harald Bluetooth appears. Back home, Kardach found in the reference work “A History of the Vikings” the image of the Jelling stone and the line that Harald had “united all of Denmark”.
Evidence. Kardach proposed “Bluetooth” as a codename – because Harald once united tribes, just as the new technology was meant to unite devices. The name was only meant as a placeholder, to be replaced by “RadioWire” or “PAN”. But “PAN” was useless as a trademark (too many hits), and the trademark check for “RadioWire” wasn't finished in time. So the codename stayed – and became world-famous. (Source: Jim Kardach, EE Times; Bluetooth SIG.)
The Logo Is a Bind Rune
And the blue sign itself? It is a bind rune – two runes of the Younger Futhark laid over each other: Hagall (ᚼ, sound value “H”) and Bjarkan (ᛒ, sound value “B”) – the initials of Harald Bluetooth.
ᚳHagall — “H”
+
ᚲBjarkan — “B”
=
ᚳᚲHarald's monogram
Officially confirmed. The Bluetooth SIG itself states: the logo is a bind rune merging the Younger Futhark runes Hagall (ᚼ) and Bjarkan (ᛒ) – Harald's initials. So practically every smartphone, every pair of headphones and every speaker in the world carries the monogram of a Viking king.
Runes Preserve Names
That is exactly what fascinates us about runes: they hold a name fast – durably, clearly, across centuries, as with Harald. Try it yourself: with our Rune Name Generator you can write your own name in real runes and save it as an image. More on the signs themselves is in our runes post.
And if the image is to become a lasting piece – engraved in slate, wood or glass – you've come to the right place.
Sources & Evidence
Bluetooth SIG, “Origin of the Bluetooth name” – logo as a bind rune (Hagall + Bjarkan) and the codename story.
Jim Kardach, “Tech History: How Bluetooth got its name”, EE Times (2008) – Bengtsson novel, Gwyn Jones reference work, RadioWire/PAN.
National Museum of Denmark – the large Jelling stone, depiction of Christ, “baptismal certificate”, and its reading as self-portrayal (Harald Klak, 826).
UNESCO World Heritage – Jelling Mounds, Runic Stones and Church (since 1994).
Viking Ship Museum Roskilde – Ravning bridge; Trelleborg ring fortresses (dendro-dating c. 975–980).
Chronicle of Roskilde (c. 1140) – earliest attestation of the epithet; the meaning of “Bluetooth” remains uncertain.
