I can not understand what this outlet is for?

Dmitry asks:

I found such a strange connector in a rented apartment in Denmark. I went through the entire Internet and even in the rarest types of sockets I did not find this. What kind of dinosaur is this? And are there such adapters or is it easier to change to a European one?

The answer to the question:

Hello! I also do not know and could not find information about this type of outlets. Perhaps this is not an electric outlet at all, but how, for example, were there previously sockets for radio dots or something like that? For me, for some reason, it resembles an acoustic connector.

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