Turkestani is an early variety of the Brahmi script, adapted with additional diacritics for use with various Central Asian languages including Tocharian, Uygur, and Tumshuqese. There are thought to have been two varieties of the script; North Turkestan Brahmi and South Turkestan Brahmi. It fell out of use following the Muslim invasions of Central Asia during the 7th century CE.
This script is not currently recognized by ISO 15924, but is included in ScriptSource for research purposes. If you have any information on this script, please add the information to the site. Your contributions can be a great help in refining and expanding the ISO 15924 standard.