Volapük
Volapük is a constructed language created in 1880 by Johann Martin Schleyer. There are an estimated 25-30 Volapük speakers in the world today. The name comes from "vol" and "pük" which in turn come from the English words "world" and "speech".
Volapük's ISO 639 language code is vo, and there is a Volapük version of Wikipedia.
More Info on Volapük
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