Jisho

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有声両唇摩擦音
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Wikipedia definition
1. Voiced bilabial fricative​The voiced bilabial fricative is a type of consonantal sound, used in some spoken languages. The symbol in the International Phonetic Alphabet that represents this sound is ⟨β⟩, and the equivalent X-SAMPA symbol is ⟨B⟩. The symbol ⟨β⟩ is the Greek letter beta. This symbol is also sometimes used to represent the bilabial approximant, though that is more clearly written with the lowering diacritic, ⟨β̞⟩. The bilabial fricative is diachronically unstable and is likely to shift to [v v].
Read “Voiced bilabial fricative” on English Wikipedia
Read “有声両唇摩擦音” on Japanese Wikipedia
Read “Voiced bilabial fricative” on DBpedia

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