Union Jack Union Jack The Union Jack, or Union Flag, is the national flag of the United Kingdom. The flag also has an official or semi-official status in some other Commonwealth realms: for example, it is a ceremonial flag in Canada by parliamentary resolution, and known there as the Royal Union Flag. Further, it is used as an official flag in some of the smaller British overseas territories. The Union Flag also appears in the canton (upper left-hand quarter) of the flags of several nations and territories that are former British possessions or dominions, as well as the state flag of Hawaii.
Union Jack using the jack staff (a flag pole attached to the bow of a ship). The term "Union Jack" possibly dates from Queen Anne's time (r. 1702–14), but its origin is uncertain. It may come from the 'jack-et' of the English or Scottish soldiers, or from the name of James I who originated the first union in 1603. Even if the term "Union Jack" does derive from the jack flag, after three centuries, it is now sanctioned by use and has appeared in official use, confirmed as the national flag by Parliament and remains the popular term. Winston Churchill was Prime