Early in the history of the Achaemenid dynasty, a syllabic script to write the Old Persian language was developed in the Persian Empire. Although the physical appearance of Old Persian signs are cuneiform, or in the shape of wedges, the actual shape of the signs do not correspond to signs in Sumerian and Akkadian systems with similar phonetic values, hence is not considered a descendant of those older systems . Old Persian only kept the cuneiform appearance of its characters simply out of tradition, and the actual shape of the signs were completely original. The Old Persian "syllabary" is somewhat of a misnomer, in that it also contains some logograms. However, since the majority of signs are syllabograms, Old Persian is classified as a syllabic script[1].


Numbers in Old Persian




"I, Cyrus the King, an Achaemenid"



Sources:
[1] AncientScripts.com
[2] Circle of Ancient Iranian Studies (CAIS)