The Union Flag, also known as the Union Jack, is the flag of the United Kingdom.It is known as the Royal Union Flag in Canada.
The three component crosses that make up the Union Flag are St. George's Cross England,
St. Andrew's Cross Scotland and St. Patrick's Cross Ireland
. The current design dates from the Union of Great Britain and Ireland in 1801.
When the first flag was introduced in 1606, it became known simply as "the British flag" or "the flag of Britain"