if its a copper tile it looks like it has a
Syllabic alphabet on it, maybe it was inported
the site says there are Syllabic alphabets used mainly
for decorative, ceremonial or religious purposes
near bottom of pg,
The Tibetan alphabet is syllabic, like many of the alphabets of India and South East Asia. Each letter has an inherent vowel /a/. Other vowels can be indicated using a variety of diacritics which appear above or below the main letter.
Syllables are separated by a dot.
Consonant clusters are written with special conjunct letters. http://www.omniglot.com/writing/tibetan.htm
edit, forgot to ask where you found it,interesting whatever it is