The inscription in it is extremely decorated. We presume it reads: – سبحان الله «Praise to Allah.» Between the chain of rhombuses we can see the repeating texts made with small turquoise glazed bricks. The text is a prayer formula praising Allah (kalima-yii tamjid): – «Glory be to Allah, all Praise be to Allah, there is no god but Allah, Allah is great.» The parts of a single formula are repeated four times here: – «Allah is one.»
The left corner tower has the same inscriptions. The facing is also partially destroyed here. Here the following formula is repeated: الله الملک – «Allah is the Lord.»
You can learn more about the topic in the book-album "Architectural epigraphy of Uzbekistan. Qashqadaryo, Shahrisabz" of the series "Architectural epigraphy of Uzbekistan".