Muqarna

Muqarnas
System of projecting niches used for zones of transition and for architectural decoration.
Definition ...

Muqarnas in the Shah Mosque, Isfahan, Iran
A muqarna (pl. muqarnas) (Arabic:مقرنس) is a type of corbel used as a decorative device in traditional Islamic and Persian architecture.

muqarna
A type of decorative corbel used in Islamic architecture that in some circumstances, resembles stalactites.
mushrabiyah ...