History of the Greek alphabet consonant letter, rather than seemingly have two exceptions in spelling. Greek, like Phoenician, made a distinction for vowel length; indeed, Greek had five short vowels and seven long vowels, but only five vowel letters. As in Phoenician, the difference in length was not originally made in writing. However, by the 6th century BC the letter eta (not needed for a consonant in eastern dialects of Greek, which lacked ) came to stand for the long vowel , and a new letter, omega, was developed for long . The provenance of omega is not known, but it is generally assumed to
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