The Only National Flag on Earth That Isn't a Rectangle
Nepal's flag is built from two stacked crimson pennants, crowned with a moon and a sun. It is the single non-quadrilateral national flag in use anywhere in the world — a geometric fact, not a metaphor, fixed by formula in Nepal's constitution.
Quick Facts
| National Flag | Two stacked crimson pennants with a blue border, moon and sun |
| Nepali Name | नेपालको राष्ट्रिय ध्वजा |
| Shape | Double pennant (non-quadrilateral) — the only one of its kind among national flags |
| Colours | Crimson red field, deep blue border, white emblems |
| Symbols | Crescent moon (upper pennant), twelve-rayed sun (lower pennant) |
| Adopted (current form) | 1962, alongside Nepal's constitution |
| Construction Method | Defined geometrically by compass-and-straightedge formula, not free-form art |
| Symbolism of Red | The rhododendron, Nepal's national flower, and the bravery of its people |
| Symbolism of Blue Border | Peace |
| Legal Status | Defined precisely in the Constitution of Nepal, Schedule 1 |
A Flag Defined by a Formula, Not a Free Hand
Most national flags are rectangles filled with stripes, crosses or charges. Nepal's is the lone exception: two pennants, one stacked above the other, descended from a long regional tradition of triangular battle and temple banners. Where most flags can be redrawn loosely and still pass, Nepal's constitution fixes its outline with an explicit geometric construction — meaning that, in principle, no two correctly drawn Nepali flags can disagree on shape.
That unusual rigor is part of what makes the flag a genuine outlier in vexillology, the study of flags: it is simultaneously the most mathematically defined and the most visually distinct flag in use by any country today.
Geometry of the Flag
- Draw the left edge (the flagpole side) as a straight vertical line of a chosen length.
- From its base, mark a point partway up to begin the lower pennant's diagonal.
- Construct the upper pennant as a triangle, then the lower pennant as a second, slightly larger triangle directly beneath it.
- Trim the outer points of both pennants using a defined offset, producing the flag's signature folded-looking tips.
- Inset a blue border of fixed width along the entire outline.
- Place the moon emblem in the centre of the upper pennant and the sun emblem in the centre of the lower pennant.
This step-by-step compass-and-straightedge method is unique among national flags — most countries specify proportions, not full geometric construction. The approach guarantees the same silhouette regardless of who draws it, which is part of why the shape has stayed unchanged even as the emblems inside it were simplified in 1962.
Colours & What They Represent
Why the Sun and Moon?
Set in the upper pennant, the moon stands for Nepal's cool, shaded climate and carries the hope that the nation will endure for as long as the moon exists in the sky.
Set in the lower pennant, the sun stands for the intense heat of the southern lowlands and the same wish for permanence, mirroring the moon's symbolism.
History of the Flag
The double-pennant shape predates the modern Nepali state, drawing on a regional tradition in which Hindu rulers and temples flew triangular banners as marks of authority. Over generations, two such pennants belonging to rival branches of a ruling house are said to have been combined into a single flag — a literal stitching-together of lineages into one symbol.
Early versions of the flag carried more ornate, human-faced depictions of the sun and moon. These were simplified into the plain crescent and sun rays used today when the flag's current geometric form was formally standardised in 1962, bringing the design in line with the new constitution.
Timeline
Triangular pennants are flown by regional rulers and temples across the hills, the visual ancestor of today's flag.
Pennants associated with allied ruling houses are combined into a single stacked double-pennant banner.
The flag carries more elaborate sun and moon faces, used informally without a single fixed geometric standard.
The current constitution formally codifies the flag's precise geometric construction and simplified emblems.
The flag remains unchanged in law and continues to be cited internationally as the only non-rectangular national flag.
Legal Status & Flag Protocol
- 1Constitutional definition: the flag's geometry, colours and emblem placement are specified directly in the Constitution of Nepal.
- 2Correct construction: official versions are expected to follow the prescribed compass-and-straightedge method rather than free reproduction.
- 3Respectful display: the flag is expected to be flown intact and undamaged, and never allowed to touch the ground.
- 4National observances: the flag is prominently displayed on government buildings during national holidays and official ceremonies.
Nepal's Flag vs. Typical National Flags
| Feature | Nepal | Most Countries |
|---|---|---|
| Overall Shape | Double pennant (non-rectangular) | Rectangle |
| Defined By | Full geometric construction | Width-to-height ratio only |
| Core Emblems | Moon and sun | Stars, crosses, stripes, or charges |
| Historical Root | Combined ruling-house pennants | Often derived from European flag traditions |
Interesting Facts
Frequently Asked Questions
References
- Constitution of Nepal, Schedule 1 — flag construction
- Government of Nepal — official portals on national symbols
- Flag Institute & vexillological references
- Encyclopaedia Britannica
- Nepal Tourism Board cultural resources
- Peer-reviewed historical and cultural studies journals