An iwan (Persian: ایوان also spelled ivan) is a hall or space, usually vaulted, walled on three sides, with one end entirely open. The formal gateway to the iwan is called pishtaq, a Persian term for a portal projecting from the facade of a building, usually decorated with calligraphy bands, glazed tilework, and geometric designs. Firouzeh ( فیروزه ) means Turquoise (color) in Persian.