A semivowel and letter in the Esperanto alphabet, which was devised in the late 19th century. (In terms of a word's syllable structure, the nature of a semivowel is more like a consonant than a vowel, in that it does not form the heart of a syllable; a semivowel combines with a true vowel to form a diphthong.) It too is pronounced consistently as [w] in SAMPA.
It is almost certain that the Esperanto letter was taken from the Belarusian, because:
Belarusian is the only natural language whose orthography contains this letter.
The letter has the same pronunciation in the two languages.
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