Avestan Ze and the Consistency of the Pairs

The voiced sibilant is written separately from the voiceless one, as every voiced and voiceless pair in this alphabet is. The consistency is the argument: nowhere does the script make a distinction in one place and quietly drop it in another. The gap between the words and the writing is the central fact about this alphabet, and it runs in both directions. The Avesta is far older than the script, and every surviving manuscript is far younger, so the script sits between two long stretches of transmission and belongs wholly to neither.

The Zoroastrian communities that carried these manuscripts, in Iran and in western India, are small, and the copying was sustained by priestly families rather than by any large institution. That the texts survive at all is a consequence of that continuity. In the digital record the letter is encoded at U+10B30 AVESTAN LETTER ZE. 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. Zoroastrianism is a living religion with a small community, and the Avesta is its liturgy rather than its archive. The letters of this alphabet are therefore not an antiquarian matter. They record sounds a priest is still expected to produce.