Conditional sale. A sales contract that provides an option to the buyer to annul the deal. See al-khiyar.
Bai‘ al-mubadalah
Qimar
Fard-kifayah
Dar al-arqam
Shafi‘ jar
Bai‘ al-salam
Al-khitmah
Ilm al-yaqin
Taslim
Habal al-habalah