I was not familiar with this term before, had to look it up.
It makes for a fun acronym DACH meaning roof in german. If they used Ö why not DÖS with an S for Schweiz then ?
Because this consortium seemingly has nothing to do with receiving license plate assignments. And the acronym seems to derive from your general vernacular, lending its name to many other things.
https://en.wikipedia.org/wiki/Geographical_distribution_of_G...