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The national flag of Bahrain (Arabic: علم البحرين‎) consists of a white band on the left, separated from a red area on the right by five triangles that serve as a serrated line. The five white triangles symbolize the five pillars of Islam. It is sometimes mistaken for the flag of Qatar, but that flag is maroon, not red, has more points (9) and normally has a much greater length-to-width ratio.

Source: Wikipedia