EDIT Za/Զա is the 6th letter of armenian alphabet. Its form undergoes considerable transformation. The oldest form gradually changes and drops below the line in the minuscule. A series of intermediate forms are created between the uncial and the minuscule. The minuscule undergoes simplification.
Za/[zɑ] is pronounced as [z].

The numerical Value of Za is 6.


Source:
Album of Armenian Paleography
Michael E. Stone, Dickran Kouymijan, Henning Lehmann
Aarhus University Press 2002

 tat