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In page Flag of Nepal:

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Historically, triangular shaped flags in South Asia were very common, since it was compact in size so the flag furled even with the lowest wind, thus making it visible over long distances.[citation needed] The traces of triangular flags could be found in Hinduism.[1] The flag's history is vague and there are no specific accounts of its creator. Nepal has historically used both quadrilateral flags as well as non-quadrilateral flags throughout its history.[2]