(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.
Rabb al-‘amal
Hayat tayibah
Bai‘ al-sinin
Bai al-thunya
Mark-Down
Musharakah Mutanaqisah
Ibra’
Iman bil gha'ib
Bai al-thimar
Mudarib