Most national flags in the world are rectangular, but Nepal's flag is the only one that is not a quadrilateral. Instead, it consists of two stacked triangles (pennons). The crimson red color is Nepal's national color and symbolizes bravery, while the blue border represents peace. The two symbols on the flag—the sun and the moon—originally represented the hope that the nation would last as long as these celestial bodies. The unique shape of the flag is a tradition that dates back centuries, representing the Himalayan Mountains. It is so distinct that the Nepalese constitution actually includes a step-by-step geometric guide on how to draw it precisely.