The qa'a (Arabic: قاعة, romanized: qāʿa) is a roofed reception room found in the domestic architecture of affluent residences of the Islamic world. It is the most common hall type in the medieval Islamic domestic architecture. The plan of a qa'a may be inspired by the four-iwan plan (cruciform) of religious buildings. They were used to welcome male guests, where they would sit on the raised platform.