What geometric shape is formed by Nepal’s national flag?

Nepal’s national flag forms two stacked pennants.

It is the world’s only national flag that is not quadrilateral. The design consists of two joined triangular pennants, with a blue border surrounding crimson-red fields. A stylized white moon appears in the upper pennant, and a white sun with rays appears in the lower one.

The two pennants are often interpreted as representing the Himalayan peaks or the major political traditions that shaped Nepal. The moon and sun express the hope that Nepal will endure as long as those celestial bodies. Crimson is Nepal’s national color, while blue traditionally represents peace.

Nepal’s constitution specifies the flag’s construction through a detailed geometric diagram and mathematical instructions rather than by treating it as a simple rectangular banner. The flag is therefore not merely triangular in outline: its defining form is two distinct pennants arranged vertically.