The Thai flag, also known as the tricolour flag, features five horizontal stripes: red, white, blue, white, and red. The central blue stripe is twice as wide as the others. It was officially adopted on September 28, 1917, by a royal decree issued by Rama VI. Since 2016, this date has been celebrated as a national day of importance in Thailand, dedicated to honouring the flag.

The colours of the flag symbolize key elements: red represents the land and its people, white symbolizes religion, and blue represents the monarchy. These colours align with the unofficial motto of Thailand, which emphasizes nation, religion, and king. Notably, the choice of blue is significant as it was considered an auspicious colour by Rama VI. Some also point out that the flag’s colours mirrored those of countries like the UK, France, Russia, and the United States, coinciding with Thailand’s declaration of war on Germany in July of the same year.

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