Plural of sakk, which refers to an Islamic financial certificate representing undivided, partial ownership in a debt (sukuk al murabaha), property (sukuk al ijarah), project (sukuk al istisna’a), business (sukuk al musharaka), or investment (sukuk al istithmar). A sakk, hence, is technically and practically different from a conventional bond which is merely and abstractly a promise to repay a debt at a given future date.

Sakk is Arabic for a legal instrument such as check or deed.