 The Proto-Slavic language did not have the phoneme /f/, and the letters Fert () and Fita () were used for transcribing words of Greek origin, and so was Izhitsa () for the Greek upsilon.The Glagolitic alphabet was added to the Unicode Standard in March 2005 with the release of version 4.1.The Unicode block for Glagolitic is U+2C00–U+2C5F.