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The shape comes from the tall, snowy Himalayan mountains, the two triangles look a little like mountain peaks. The flag is a deep red, the colour of Nepal's national flower, the rhododendron, with a bright blue border around the edge.
Inside the flag are two white shapes from the sky. The top triangle holds a moon, and the bottom triangle holds a sun. People say they carry a wish: that Nepal will last as long as the sun and the moon are in the sky.
The design is very old and is fixed by special rules, there is even a step-by-step maths recipe for drawing it exactly right. Because it is so unusual, children all over the world remember Nepal's flag the moment they see it.