Avestan Aa and the Writing of Vowel Length

A separate sign for the long a is one of the plainest gains the new alphabet made over the writing behind it. Where the older hand could leave the length of a vowel to be inferred, the Avestan letter states it, and a reciter reading from the page is told how long to hold the sound. The shapes come from Pahlavi and the inventory does not. Whoever assembled this alphabet worked from an analysis of the recitation, added signs where the parent hand had none, and ordered the result by place of articulation instead of by the letter sequence that lay behind everything else written in Iran at the time.

Modern editions preserve the distinctions the manuscripts make, including the ones that look redundant, and transliterate them with accents, dots and length marks so that nothing collapses on the page. The apparatus of marks in a scholarly Avestan text is a direct consequence of how many separate signs the alphabet carries. In the digital record the letter is encoded at U+10B01 AVESTAN LETTER AA. The Avestan block sits wholly in the supplementary planes, and every letter in it takes four bytes in the encoding most of the web runs on. That is the practical reason Avestan text is still uncommon online, and why a page carrying it depends on the reader having a font that covers the range. What this alphabet holds is a performance. The atlas describes it and does not instruct in it: the recitation belongs to the community that maintains it, and the interest here is in what the script was built to do and how well it did it.