RAHN. رهن
Pledging or pawning. A Legal term which signifies the detention of a thing on account of a claim which may be answered by means of that thing; as in the case of debt. This practice of pawning and pledging is lawful in Islam, for it is related that the Prophet, in a bargain with a Jew for grain, gave his coat of mail in pledge or the payment. It is also said in the Qur’an, Surah ii 28:- “Let. pledges be taken. The word is used in the Qur’an in its plural form rihan. (For further information on the subject of Pawning, see Hamilton’s Hidayah, vol. iv. p. 188.)

Based on Hughes, Dictionary of Islam