Is it possibly the Khwarezmian script, used for a now-extinct Eastern Iranian language that was spoken in the Oxus (Amu Darya) river delta? This region in Central Asia is known in the Avesta as hvâirizem (Yašt 10.5.14). It is called خوارزم xvārazm in classical Persian, which is transcribed as ‘Khwarezm’ in English. The Greeks knew it as Χορασμία, and this hellenic form entered the English lexicon as ‘Chorasmia’. The territory lies across portions of present-day Uzbekistan, Kazakhstan, and Turkmenistan. The script probably developed from the Imperial Aramaic used around the Aral Sea and Oxus river delta. It evolved into a ‘cursive’ script by the 9th century. Similar to its sister Sogdian, which was used along the Silk Road.