This ancient Scandinavian rune means “intermittent.”
@Quinnypig I thought it meant “fight each other for the one available connection”, but maybe that’s from a regional dialect.

@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

Chronicon Roskildense - Wikipedia

The article itself brings up where the nickname supposedly comes from, but all of the theories (things about the colour of his teeth, expensive blue clothing, etc) are deemed unlikely to be true, by the history professor.