Prayer Rug. A rug or small carpet intended to be spread on the floor of a mosque or on the ground by a Moslem when engaged in his devotions. He stands on it with his face turned towards Mecca, and prostrates himself, touching the carpet with his forehead from time to time. In many of the prayer rugs of Persia and Arabia the place to receive the forehead in prostration is indicated in the pattern at one end of the carpet. They are among the finest rugs imported to this country.