is a semicircular niche in the wall of a mosque that indicates the `` qibla '' ; that is , the direction of the Kaaba in Mecca and hence the direction that Muslims should face when praying .
محاريب ) is a niche in the wall of a mosque . It indicates the `` qibla '' ( the direction of the Kaaba in Mecca , the direction that Muslims should face when praying ) .