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Bluetooth was a service associated with wireless technology in the 21st century.
In Pete's World, the Tenth Doctor compared the Cybus EarPods to the "Bluetooth attachments" of his own universe. (TV: Rise of the Cybermen [+]Tom MacRae, adapted from Spare Parts (Marc Platt), Doctor Who series 2 (BBC One, 2006).)
In 2006, Julian Delaware made a revived WOTAN accessible through Bluetooth. (AUDIO: The Law Machines [+]Matt Fitton, Machines (Torchwood One, Big Finish Productions, 2018).)
Wireless speakers were sometimes known as "Bluetooth speakers". (AUDIO: Doomscroll [+]Ash Darby, Among Us (Among Us, Big Finish Productions, 2023).)
Behind the scenes[]
In the real world, the name "Bluetooth" is derived from the 10th century Danish and Norwegian king Harald Bluetooth. However, this fact and Harald Bluetooth as a historical figure have not been mentioned in any DWU media.