"The Ashraf caste are the highest and claim to be descendants of Prophet Muhammad, or other Arab chiefs, or Turks, or Persians. The Ajlaf are people of Indian origin who got converted by Islamic invasions; the Arzal are the lowest castes among Muslims. The Urdu word, quam , refers to caste and is commonly mentioned in matrimonial advertisements in Pakistan. In theory, caste is ostensibly banned in Islam, and so the politically correct interpretation of quam is ethnicity or community with common heritage. There are communities that identify themselves as Dalit Muslims."