"Union Jack" is the traditional name of the national flag of the United Kingdom of Great Britain and Northern Ireland, it is also officially "Union Flag" called. The flag is passed in its current form since 1801.
Design of the British flag
The Union Jack presented a superposition of the English flag (red cross on a white ground, known as St. George's Cross), the Scottish flag (white St. Andrew's cross on a blue background) and the Irish flag (red St. Andrew's cross on a white background, the so-called St. Patrick's Cross) represents.
Origin of UK flag
The Union Jack was a result of the personal union between Scotland and England under King James I, first introduced in 1606  and used to the 1649th He presented in its original form represents only a superposition of the flags of England and Scotland.
After the English Civil War, the flag of England was extended to 1654 by the Irish harp, which was until 1660 in the middle of the flag.
From 1660 to 1801, then back to the original Union Jack used. 1707, the final union of Scotland and England was in the Act of Union, the 1707th.
1801 with the political integration of the neighboring island of Ireland, the former Irish flag was added to the Union Jack.
The asymmetry of the Union Jack comes from the fact that the Scottish St. Andrew's cross and the Irish St. Patrick's Cross equal "side by side" should stand. Heraldic reach the by their icons are not centered over each other, but against each other "moves". The English St. George's Cross is as central to all other crosses, symbolizing the dominance of England over the country Scotland and Ireland.
1809 the Union Jack was declared by Parliament to the British national flag.
The flag of Wales, however, has never found inclusion in the Union Jack because Wales was already by the Act of Union in 1536, long before the founding of the United Kingdom connected to England, however, there are plans for a Union Jack with the Welsh David Cross (yellow cross on a black background). The British Culture Minister Margaret Hodge closed 2007 a redesign is not enough.
Description Union Jack
The name "Jack" refers to the original use as Bugfahne in (war) ships under Charles II (in German: "Gosch"). Other names explanations are that "Jack" by the soldiers clothing or the name derives James I who introduced the flag in its original form.