Avestan Oo and the Policy Behind the Pairs

The long back o completes a pair, and the pairing is the structural fact worth noticing. Vowel length is written eight times over in this alphabet, in every quality it distinguishes, which is a policy rather than a run of separate choices. 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+10B0B AVESTAN LETTER OO. The block covers the letters together with a small set of punctuation marks used in the manuscripts. Standardising it settled, for digital purposes at least, a question the printed editions had answered in several different ways, which is how many letters the alphabet has. For the community the value of a script that writes every sound is continuity. It makes it possible to check a recitation against a page rather than against another reciter's memory, which is what the alphabet was for and what it still does.