To either side of the Iconostasis is a "kliros", from which the singers chant the service. A banner is usually mounted at each kliros. The banner on the right (south) side often has a mandylion on it; the one on the left (north), an icon of the Theotokos. There may be more banners as well: banners of Saint Nicholas and the Patron Saint of the church or monastery are very common. The two choirs ("klirosi") symbolize the ranks of the Church Militant, and the banners represent the victorious triumph of Christ over the world, sin and the devil.