Relating to the sources of Islamic law, it is the custom and the usage of a particular society.
Al-kafalah
Al-istislaf
Al-ghulul
Al-hamalah
Al-hamulah
Al-amin al-khas
Al-khatam al-jami'ah
Al-dain al-mutlaq
Al-rahn bil darak
Al-sadaqat al-wajibah