(lit. pillar, pl. arkan) In fiqh, an integral part of an act, such as a transaction, without which the act can not be said to have been performed.
Islamic banking
Shirkah al-tadamun
Bait al-dawai
Bay` bi-thaman ajil
Transferable ’Ijarah Warrants
Nasib al-mithl
Shirkah al-‘amal
Bai‘ al-juzaf
Al-‘adl
Kaffarah