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 As in Phoenician, the difference in length was not originally made in writing.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
Lydian alphabet instead. Lydian uniquely features a quotation mark in the shape of a right triangle. The Lydian alphabet is closely related to the other alphabets of Asia Minor as well as to the Greek alphabet. It contains letters for 26 sounds. Some are represented by more than one symbol, which is considered one "letter." Unlike the Carian alphabet, which had an "f" derived from Φ, the Lydian "f" has the peculiar "8" shape also found in the Etruscan alphabet. In addition two digraphs, "aa" and "ii", appear to be allophones of [a] and [i] under speculative circumstances, such as lengthening from