ایوان

thumb|330px|Multiple iwans and tiled domes of the 16th-century Persian-style Po-i-Kalyan#Mir-i Arab Madrassah|Mir-i-Arab madrasa, [[Bukhara, Uzbekistan]] An iwan (, also ivan or ivān/īvān; ) is a rectangular hall or space, usually vaulted, walled on three sides, with one end entirely open. The formal gateway to the iwan is called '''''', a Persian term for a portal projecting from the facade of a building, usually decorated with calligraphy bands, glazed tilework, and geometric designs. Since the definition allows for some interpretation, the overall forms and characteristics can vary greatly