Zhang Zhung scripts

The Zhang Zhung ཞང་ཞུང culture (pronounced shang shung in the modern Lhasa dialect) is an ancient culture that flourished in the western and northern parts of Tibet before the introduction of Buddhism into the country during the 7th century. For a long time there was little concrete evidence of the existence of the Zhang Zhang kingdom described in Tibetan sources, and it was regarded as semi-legendary by some Western scholars, but in recent years archaeological investigation has confirmed the existence of an extensive early Tibetan culture that has been identified with that of the Zhang Zhung.

http://babelstone.blogspot.com/2007/05/zhang-zhung-scripts.html