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The UNION JACK — the national flag of the United Kingdom — combines blue, red, and white, each with deep historical and symbolic meaning.
The Union Jack unites the crosses of three patron saints:
St. George (England) – Red cross on a white field
St. Andrew (Scotland) – White diagonal cross (saltire) on a blue field
St. Patrick (Ireland) – Red diagonal cross on a white field
These were merged over time to form the modern Union Flag (commonly called the Union Jack).
