Q
Qibla
Direction of Mecca that determines the direction of prayer. The qibla is the prime factor in the orientation of mosques and is usually marked by a mihrab. (associated with Islam)
Qubba
Often used to refer to a domed mausoleum or shrine containing the grave of a saint or an important personage. (associated with Islam)
Quoins
Dressed stones at the external angles of a building/church. (associated with multiple faiths)