Flag of the United Kingdom

The Union Flag, is the national flag of the United Kingdom, may be referred to as the Union Jack when flown from a ship of the Royal Navy, as well as a flag with an official or semi-official status in some Commonwealth realms; for example, it is known by law in Canada as the Royal Union Flag. It is also used as an official flag in some of the smaller British overseas territories. The Union Jack also appears in the canton (upper left-hand quarter) of the flags of several nations and territories that were former British colonies.