The stat emblem of great britain

THE STAT EMBLEM OF GREAT BRITAIN
The current design of the Union Jack dates from the union of Ireland and Great Britain in 1801. It consists of the red cross of Saint George (patron saint of England), edged in white, superimposed on the Cross of St Patrick (patron saint of Ireland), which are superimposed on the Saltire of Saint Andrew (patron saint of Scotland). Wales is not represented in the Union Flag by Wales's patron saint, Saint David, as at the time the flag was designed Wales was part of the Kingdom of England.
The flag's standard height-to-length proportions are 1:2. The war flag variant used by the British Army modifies the proportions to 3:5 and crops two of the red diagonals.
The earlier flag of Great Britain was established in 1606 by a proclamation of King James VI and I of Scotland and England The new flag of the United Kingdom was officially created by an Order in Council of 1801, reading as follows:
The Union Flag shall be azure, the Crosses saltire of Saint Andrew and Saint Patrick quarterly per saltire, counter-changed, argent and gules, the latter fimbriated of the second, surmounted by the Cross of Saint George of the third fimbriated as the saltire.

Evolution of the Union flag.
The Union Flag can be flown by any individual or organisation in Great Britain on any day of their choice. Legal regulations restrict the use of the Union Flag on Government buildings in Northern Ireland. Long-standing restrictions on Government use of the flag elsewhere were abolished in July 2007.
Upside-down
While the flag appears symmetric, the white lines above and below the diagonal red are different widths. On the side closer to the flagpole (or on the left when depicted on paper), the white lines above the diagonals are wider; on the side farther from the flagpole (or on the right when depicted on paper), the converse is true. Thus, no change will be apparent when rotating the flag 180 degrees, but if mirrored the flag will be upside-down.
Placing the flag upside down is considered lèse majesté and is offensive to some. However, it can be flown upside down as a distress signal. While this is rare, it was used by groups under siege during the Boer War and during campaigns in India in the late 18th century.