Nepal has the world’s only non-quadrilateral national flag, with a double-pennon shape.
The flag consists of two joined triangular pennants with a deep blue border. Its crimson-red field is associated with bravery and is also Nepal’s national color, while the blue border represents peace and harmony. The upper pennant contains a stylized moon, and the lower pennant contains a stylized sun.
The current design was adopted on December 16, 1962, after Nepal established a new constitutional system. Its two pennants are derived from earlier royal and family banners used in the Himalayan region. The flag’s proportions and construction are specified in Nepal’s constitution, making it unusually precise among national flags.
The moon and sun symbolize permanence and the hope that Nepal will endure as long as those celestial bodies. Nepal’s flag is often described as triangular, but its defining feature is that it combines two stacked pennants rather than forming a rectangle or square.