General terms:
* خط جميل (khatt jamil): This literally translates to "beautiful script" and is a common way to describe aesthetically pleasing Arabic writing.
* خط رائع (khatt ra'i'): This translates to "wonderful script" and emphasizes the impressive quality of the writing.
Specific terms depending on the style:
* خط نسخ (khatt nasakh): This is a clear and elegant script often used for Quranic manuscripts and formal documents.
* خط ثلث (khatt thuluth): This is a highly stylized script with a strong emphasis on curves and flowing lines, often used for decorative purposes.
* خط ديواني (khatt diwani): This is a cursive script known for its beautiful flourishes and is traditionally used for official documents.
* خط كوفي (khatt kufi): This is a square and angular script often used for inscriptions and decorative purposes.
Ultimately, the best term to use will depend on the specific style of writing and the context in which you are discussing it.