The national flag of Oman consists of three stripes (white, green and red) with a red bar on the left that contains the national emblem of Oman. The white stands for peace and prosperity, the green for fertility and the Green Mountains, and the red for battles against foreign invaders. The red is also the color of the former flag of the nation when it was known simply as the Sultanate of Muscat and Oman. (source)
Thank you Sumie for a great Oman flag card!