Nepal has the world’s only non-rectangular national flag, shaped with two triangular pennants.
Nepal’s flag consists of two stacked triangular shapes with a deep crimson field, a blue border, and white symbols of the moon and sun. The two pennants are associated with the country’s historical royal houses and Himalayan traditions. The crimson color is linked with bravery and is also Nepal’s national color, while blue represents peace.
The modern constitutional design was adopted in 1962, although the double-pennant form is much older. The moon and sun originally had stylized facial features, which were removed from the flag in a 1962 standardization. The celestial symbols also express a wish that Nepal endure as long as the moon and sun.
Nepal’s constitution includes a precise geometric construction method, so the flag can be drawn without relying on a simple rectangular template. It is often described as the only national flag that is not quadrilateral, although the phrase “only non-rectangular national flag” is the more common summary.