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 superior position but since it is reversed it does not precede the other flags. The coat of arms of the Chilean city of Coquimbo features the Union Jack, owing to its historical commercial links to Britain. The Union Flag can be found in the canton of several of the ensigns flown by vessels and aircraft of the United Kingdom and its overseas territories. These are used in cases where it is illegal to fly the Union Flag, such as at sea from a ship other than a British warship. Normal practice for British ships is to fly the White ensign