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It also means "bird" in German. That could be the origin...

The second explanation I've found is based on XVI century Slovenian-Latin dictionary that describes vogel / vogal as "angle".

During the centuries, Slovenian V became Serbian U, and L if the last letter, often becames O in South Slavic Languages, so today Serbs say "ugao". In conclusion, it could be Slavic as well.

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