ISO 15924 script code: Xpeo

The Old Persian script is an ancient writing system used primarily by the Achaemenid Empire for inscriptions in the Old Persian language. Predominantly found in modern-day Iran, it's a precursor to the Middle Persian script. Although not commonly used in today's digital era, it is supported through Unicode. The specific authorship remains unknown, but it's believed to have been standardized under Darius I.