Zhang-zhung script. This shape of calligraphy seems to be developed during the 11th century AD based on a more ancient form.

For a calligraphy sample click the picture and see a gallery of all consonats (2 pages)
[PDF-File, select all pages, click the tab "pages" and see the thumbnails, use Adobe Reader7,0].

For a calligraphy sample click the picture and see a gallery of all consonats with the 4 vowels.

[PDF-File, select all pages, use Adobe Reader7,0].