Jisho

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Wikipedia definition
1. Fu (kana)ふ, in, which is why it is romanized fu in Hepburn romanization instead of hu. Written with a dakuten (ぶ, ブ), they both represent a "bu" sound, and written with handakuten (ぷ, プ) they both represent a pu sound. The katakana フ is frequently combined with other vowels to represent sounds in foreign words. For example, the word "file" is written in Japanese as ファイル (fairu), with ファ representing a non-native sound, fa.
Read “Fu (kana)” on English Wikipedia
Read “ふ” on Japanese Wikipedia
Read “Fu (kana)” on DBpedia

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