Greek alphabet glottal ("heth") was borrowed in two different functions by different dialects of Greek: as a letter for /h/ (Η, heta) by those dialects that had such a sound, and as an additional vowel letter for the long (Η, eta) by those dialects that lacked the consonant. Eventually, a seventh vowel letter for the long (Ω, omega) was introduced. Greek also introduced three new consonant letters for its aspirated plosive sounds and consonant clusters: Φ ("phi") for , Χ ("chi") for and Ψ ("psi") for . In western Greek variants, Χ was instead used for and Ψ for . The origin
Albanian alphabet and Jani Vreto created an alphabet. This was based on the principle of "one sound one letter" (although the revision of 1908 replaced the letter "ρ" by the "rr" digraph to avoid confusion with "p"). This was called the "Istanbul alphabet" (also "Frashëri alphabet"). In 1905 this alphabet was in widespread use in all Albanian territory, North and South, including Catholic, Muslim and Orthodox areas. One year earlier, in 1904 had been published the Albanian dictionary () of Kostandin Kristoforidhi, after the author's death. The dictionary had been drafted 25 years before its publication and was written in the Greek