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Which languages were used in Achaemenid royal inscriptions?

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Neo-Assyrian clay tablet from the 7th century BC inscribed with dense cuneiform writing, known as the Flood Tablet from the Epic of Gilgamesh, displayed in the British Museum. — epigraphy The Flood Tablet, 11th cuneiform tablet in a series relating the Gilgamesh epic, from Nineveh, 7th century bce; in the British Museum, London.

Achaemenid royal inscriptions were typically trilingual, featuring texts in Old Persian, Elamite, and Akkadian (often referred to as Babylonian). These versions were inscribed using traditional logo-syllabic cuneiform for the Akkadian and Elamite texts, while the Old Persian text utilized a simplified, quasi-alphabetic system of wedge-shaped writing developed during the reign of Darius I.123

The use of these languages reflected the international character of the empire. While these three languages were standard for royal inscriptions, other languages were used in specific contexts. For instance, a granite stela of Darius I found near the Suez Canal included hieroglyphic Egyptian in addition to the standard three languages. Furthermore, while Aramaic served as the primary language of the imperial bureaucracy and was widely used across the empire, it appears less frequently in the formal, monumental royal inscriptions compared to the trilingual standard.213