History of the Greek alphabet retained the sound. A symbol based on the left-hand half ( ├ ) of the letter Η was therefore sometimes used to indicate the presence of where necessary, and its absence was indicated by a symbol based on the right half. During the classical period, ΕΙ came to be pronounced and ΟΥ came to be pronounced , Υ having meanwhile moved to . By about 200 BC, a system of diacritical marks was invented, representing the tone accents in use in Ancient Greek. This also helped to indicate the length of the vowels Α, Ι, and Υ in certain cases
Gagauz alphabet Gagauz alphabet The modern Gagauz alphabet is a 31-letter Latin-based alphabet modelled on the Turkish alphabet. Previously, during Soviet rule, Gagauz's official script was Cyrillic. Gagauz was first written in Greek letters in the late 1800s. The current 31-letter Gagauz alphabet, used for the Gagauz language, is a Latin-based alphabet modelled after the Turkish. It appears that the first alphabet to be used for the language was the Greek alphabet in the late 19th century. For example, orientalist Otto Blau claims that plays of Euripides had been translated into the Gagauz language and had been written with Greek letters. Beginning