Structure
Like the writing systems from which it is descended, the Sogdian writing system can be described as an Abjad, but it also displays tendencies towards an alphabet. The script consists of 17 consonants, many of which have alternate forms for initial, middle, and final position. As in Aramaic, long vowels were commonly written with the consonants aleph, yodh and waw. However, unlike Aramaic and most abjads, these consonant signs would also sometimes serve to express the short vowels (which could also sometimes be left unexpressed as in the parent systems). To disambiguate long vowels from short ones, an additional aleph could be written before the sign denoting the long vowel. The alphabet also includes several diacritics, which were used inconsistently. It is written from right to left, but by the time it had evolved into its child system, the Old Uyghur alphabet, it had been rotated 90 degrees, written vertically in columns from left to right. Voiced and voiceless fricatives are consistently not distinguished in the script.
Aramaic logograms also appear in the script, remnants of adapting the Aramaic writing system to the Sogdian language. These logograms are used mainly for functional words such as pronouns, articles, prepositions, and conjunctions.
Read more about this topic: Sogdian Alphabet
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