The Sogdian alphabet was originally used for the Sogdian language, which belongs to the Iranian family. It is derived from Syriac, the descendant script of the Aramaic alphabet
. It is occasionally known as the sutra script, and is similar to the script of the ancient letters used in writing on papyri. Many Buddhist, Manichaean, Nestorian, and Zoroastrian texts as well as all secular material such as letters, legal documents, coin legends, and inscriptions were written in this script. Although Soghdian is an Eastern Iranian language it has many Turkic child systems such as Old Uyghur and other eastern Turkic languages. It was generally superseded by versions of the Arabic alphabet on the conversion of the Turkic peoples to Islam. When used for the Sogdian language, this alphabet was usually written in horizontal lines from right to left. When used for Uyghur, it was normally in vertical direction from top to bottom, but with the first vertical line starting from the left side, not from the right as in Chinese, most probably because the right-to-left direction was used in horizontal writing. The Mongolian alphabet proper, being an adaptation of the Old Uyghur alphabet, still uses this kind of vertical writing, as does its remoter descendant Manchucitation needed.
See alsoReferencesWorks citedF.W. Mote (1999). Imperial China, 900-1800. Harvard University Press, 42-43. ISBN 0674012127. External links
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