Nepal’s national flag is made from two triangular pennons. Joined along their hoist-side edges, the upper and lower pennons create the flag’s distinctive double-pennon shape.
The design is exceptionally unusual: Nepal’s flag is the world’s only national flag that is neither rectangular nor square. Its crimson-red field is bordered in blue, and the upper pennon carries a crescent moon while the lower one carries a sun.
The double-pennon form comes from older South Asian banner traditions and is associated with the flags of Nepal’s ruling dynasties. The modern design was standardized by engineer Shankar Nath Rimal and adopted on December 16, 1962. Earlier versions showed human faces on the moon and sun; those faces were removed during modernization.
A common mix-up is to count the visible red sections as separate flags or to describe the shape as one irregular pentagon. Geometrically, it is better understood as two juxtaposed triangular figures forming a single national flag.