Avestan Yye: The Letter in the Avestan Alphabet

This is one of the alphabet's two signs for the palatal glide, distinguished from the other by a dot in transliteration. Both write a y, and the manuscripts are consistent about which of them is used where. The glides follow the nasals in the sequence. They are the sounds made with the least obstruction of any in the alphabet, and three signs are given to them, two for the palatal glide and one for the labial. It stands forty-third in the alphabet as a whole and twenty-seventh of the thirty-eight consonants, between Avestan Hme and Avestan Ye. The order is the work of the people who devised the alphabet rather than an inheritance from anywhere, and reading the list straight through recovers the analysis they were working from.

The Avestan alphabet was made for one text. That is unusual, and it explains a repertoire far larger than the languages around it needed. A script serving letters, accounts and contracts can afford to let two sounds share a shape, because context recovers the sense. A script serving a recitation cannot, because there the sound is the thing being preserved. One sign to one sound is the rule this alphabet works to, and it is easier to state than to keep. Most scripts break it somewhere, usually where a sound is rare enough that no scribe could be bothered, and the interest of this one lies in how few exceptions it allows itself.