Meaning

noun the basic unit of money in Yemen; equal to 100 fils

noun the basic unit of money in Oman

noun the basic unit of money in Iran

originBorrowed from Persian ریال (riyâl) (in the case of Iran) and a variant transliteration of Arabic رِيَال (riyāl) (in the case of Oman and Yemen), from Spanish real. Doublet of real, royal, and regal.

Etymology from Wiktionary, CC BY-SA 3.0