the basic unit of money in Yemen; equal to 100 fils
"After waiting hours at the bank, I finally exchanged my dollars for rials so I could buy groceries in Sana'a."
the basic unit of money in Oman
"The traveler carefully counted her rials before tipping the friendly guide at the souq."
the basic unit of money in Iran
"The cost of the new car was quoted entirely in rials, making it difficult for us to estimate its value in dollars."
The official currencies of Iran, Oman, and Yemen.
"After traveling through all three countries, she finally managed to exchange her dollars for Iranian rials, Omani rials, and Yemeni rials before heading home."