Which invention was named after a medieval king? Explained

 

The term “Bluetooth,” denoting the standard for local wireless connections, draws its inspiration from King Harald Gormsson of the Vikings, recognized for uniting Scandinavia. Much like numerous medieval leaders, King Harald possessed a moniker: blátonn in Old Norse, signifying Bluetooth. Historians suggest that his nickname stemmed from a unique dead tooth with a bluish hue. The well-known Bluetooth emblem comprises King Harald’s initials inscribed in Scandinavian script. The name was coined in 1997 by Intel mobile engineer Jim Kardach, who stumbled upon it while perusing a book on Viking history.