Avestan Shye and What Would Otherwise Vanish

A palatalised sh is the sort of distinction that survives in a recitation preserved by ear and vanishes from any tradition that relies on the page alone. This alphabet exists to stop that vanishing. 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+10B33 AVESTAN LETTER SHYE. The whole Avestan block lies above the Basic Multilingual Plane, so each character needs a surrogate pair in the encodings that use them, and a font carrying the script is required before anything appears on a screen at all. 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.