[Cyrillic] Ef (Ф ф; italics: Ф ф) is a Cyrillic letter, commonly representing the voiceless labiodental fricative /f/, like the pronunciation of {angbr|f} in `fill`. The Cyrillic letter Ef is romanized as {angbr|f}. ==History== The Cyrillic letter Ef was derived from the Greek letter Phi (Φ φ). It merged with an eliminated letter Fita... Found on http://en.wikipedia.org/wiki/Ef_(Cyrillic)