Question

what is the room with pillars in a mosque known as?

Answer 1

mahrab..

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Answer 2

                                      The room with pillars in a mosque is known as "Musalla" ( place for prayer or prayer hall) an ample open space. It is deliberately left bare as the worshipers sit, kneel and bow directly o the floor. Along the walls and pillars of the prayer hall, there are usually bookshelves to hold copies of the Quran, religious reading materials and prayer rugs.