(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.
Al-musaqah
Musharakah Mutanaqisah
Cost plus (Murabahah)
Riba al-nasi'ah
Muwakkil
Hisbah
Bai al-'inah
Murabaha
Al-daruriyat al-khams
ICD (Islamic Certificates of Deposit)