@dpnash @Quinnypig Apparently, there is no proof yet found that Denmark’s King Harald Gormsson was ever called Blåtand during his lifetime, as he died in 985 AD and the first BT mentions in writing dates back to 1140 AD, in the Roskilde Chronicle (https://en.wikipedia.org/wiki/Chronicon_Roskildense).
Source: article written by Dick Harrison (professor in history) at Lund University. I found the article in one of the big-name newspapers in Sweden, SvD (Svenska Dagbladet): https://www.svd.se/a/QVmKP/kommer-smeknamnet-av-kassa-tander
@Quinnypig #alt4you Image of the Bluetooth symbol, a bindrune of the initials of Harald Bluetooth in the younger futhark after whom the technology was named.
This is funny.
@Quinnypig Named in memory of king Harald the Intermittent, who would only talk to a new person after a surprisingly error-prone handshake procedure.
Some of his heirs learned to recall having shaken the hands of multiple people, significantly speeding up royal social events.