Bluetooth
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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 [+]Loading...["Rise of the Cybermen (TV story)"])
In 2006, Julian Delaware made a revived WOTAN accessible through Bluetooth. (AUDIO: The Law Machines [+]Loading...["The Law Machines (audio story)"])
Wireless speakers were sometimes known as "Bluetooth speakers". (AUDIO: Doomscroll [+]Loading...["Doomscroll (audio story)"])
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.