The Union Flag was first used on April 12th, 1606, to represent the regal union of Scotland and England, under King James VI of Scotland (James I of England). The nation of Great Britain, however, did not form until the Acts of Union in 1707.
The Union Jack and the Union Flag are the same thing, both names are acceptable. Some people will say that the term, Union Jack, should only be used when the flag is flown on Royal Navy ships, but this is incorrect. the Flag Institute has a full explanation, see their website, search for 'the flag institute'
The union Jack
In German, "Union Jack" is translated as "Union Jack." The term is used in the same way as in English, referring to the national flag of the United Kingdom.
Jack is another name for a flag, usually a small flag used for signaling, but in the case of the Union Jack it symbolises the union of the three countries - England, Wales, Scotland
JOE UNSWORTH INVENTED THE UNION JACK IT WAS USED IN 1700's FOR THE KING JAMES II.
the saltire 1924
Union Flag, or more casually the Union Jack
The Union Jack is the nickname of the UK flag.
The union jack on the Australian Flag is from the first white people to settle on our land, the British. The British flag is JUST the union jack, so, to celebrate the people who first settled in Australia, we have their flag in part of OUR flag. Hope that helps :)
The Union Jack gets its name from the union of different flags of the United Kingdom. It combines the crosses of St George (England), St Andrew (Scotland), and St Patrick (Ireland) to symbolize the unity of these nations. Originally, it was referred to as the "Union Flag," but the term "Union Jack" became commonly used, especially when the flag is used at sea. The name "jack" refers to a flag flown from a ship's bow.
I'm not sure what you mean by 'special name', but the official name for the British flag is: Union Jack