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 foot note that 'A Jack is a Flag to be flown only on the "Jack" Staff'. However, the authoritative "A Complete Guide to Heraldry" published in 1909 by Arthur Charles Fox-Davies uses the term "Union Jack". The term "Union Flag" is used in King Charles I's 1634 proclamation: When the first flag representing Britain was introduced on the proclamation of King James I in 1606, it became known simply as the "British flag" or the "flag of Britain". The royal proclamation gave no distinctive name to the new flag. The word "jack" was in use before 1600 to describe the