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by gpvos 704 days ago
It is neither umlaut nor diaeresis, but just an i and a j with each their own dot smushed together into a ligature, which can take either the form of a y with both those dots on top, or a more rounded form that more resembles an i and j joined together.

I guess in other languages than Dutch it could be a y with a diaeresis or umlaut.