Season 142 - Day 2 of 14

Monarchs

Harald I was a former Danish king who united several viking tribes under his rule.
We probably would have remembered him for the introduction of Christianity in the Viking world if not for a particular attribute that gave him a nickname that would inspire the name for an open standard for short range, wireless connection between devices.
What was the nickname of Harald or what wireless connection standard was developed by Ericsson in 1994?

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