Turbah
A turbah (Arabic: تربة, lit. 'soil'), or mohr (Persian: مهر, lit. 'seal'), also known as khāk-e shefā (Persian: خاکِ شِفا, lit. 'medicinal soil', also used in Urdu), sejde gāh (Persian: سجدہ گاہ, lit. 'place of prostration', also used in Urdu) or prayer stone, is a small piece of soil or clay, often a clay tablet, used during salah to symbolize Earth. The use of a turbah is recommended according to the Twelver branch of Shia Islam, a unique practice of the sect, and many ahadith mention the benefits of prostration upon soil or an alternative natural material.