What is the official currency of Oman?

Oman is ancient Arabic country, guarding an entry of the Persian Gulf on the tip of Arabian Peninsula in the Middle East. A very beautiful country with amazing oasis and mountains areas, marvellous coastline and enchanting castles, definitely a Must visit in the Middle East. simple solution just by masking the name of the currency keeps the challenge, thanks.

Oh man and therein lies Oman. Woh man was made from Adam's rib and therefore- behold! Woman.