How did the use of Muslim inscriptions change Umayyad currency?

Under the fifth Umayyad caliph, ‘Abd al-Malik, the coinage of the empire underwent a significant reform to align with Islamic principles. Prior to this, Muslim rulers had largely imitated existing Byzantine and Sāsānian coin designs, which often included pictorial representations or religious symbols like the cross and fire altar.1

‘Abd al-Malik’s "reformed coinage," introduced in the late 7th century, replaced these earlier images with skillfully arranged Arabic inscriptions. This shift removed all pictorial types from gold and silver currency, replacing them with text that emphasized the Islamic faith.1

The new inscriptions included:
* The Obverse: The Muslim profession of faith ("There is no god but God: he has no associate") and a marginal legend indicating the place and year of minting.1
* The Reverse: Quotations from the Qur’ān (specifically CXII and IX, 33) that affirm the oneness of God and the triumph of the religion of truth.1

This transition was part of a broader program of Arabization, which established Arabic as the official language of administration and created a distinct, unified currency for the empire.2