It's another word for a flag. Usually a jack is flown on the jackstaff of a ship, but in reference to the Union flag it's commonly used to describe the flag. If we were to be absolutely correct, the Union Jack would be referred to as the Union Flag.
(Not really)
"The original Union Flag was introduced in 1606 as a maritime flag,
and in 1634 a Royal Proclamation laid down that the Union Flag
was reserved for His Majesty's Ships of War and forbid
merchant ships to wear it..........
It is quite clear that the name Union Jack was the name given to
the distinguishing flag of His Majesty's Ships, and that it is proper
to call this flag a Union Jack when flying in a ship, but this flag
which was formerly purely maritime is now used as the National flag
of Britain and some consider that it is incorrect to call it a Union Jack
when it is not flying in a ship and that when flying ashore
it should be called the Union Flag.
Strictly this view may be correct, and there would be no doubt as
to its correctness if the flagused were the 1900 War Office pattern,
but this is not so, and the flag that is seen in Britain flying from the
Houses of Parliament and other public buildings is the pattern
adopted by the Royal Navy.
Furthermore, it has been called the Union Jack in modern times
in Parliament and so by common useage it is considered that it
IS CORRECT to call this flag, which is to all intents the National flag
of the United Kingdom, the UNION JACK . It would also appear that
the 1900 War Office version should not be called the Union Jack; in
fact it is generally known as the 'Great Union Flag'."
"Flags of the World"
Edited by E.M.C Barraclough C.B.E., R.N. and
W.G. Crampton M.ED.
Read more: Is_the_british_flag_called_the_union_jack
I'm not sure what you mean by 'special name', but the official name for the British flag is: Union Jack
The blue colour on the Union Flag is from the Scottish Saltire.
Union Flag, or more casually the Union Jack
The Union Jack is the nickname of the UK flag.
The jack refers to the jackstay of a ship, on which the Union Jack would be displayed. Strictly speaking the flag should be called the Union Flag, but Union Jack is well known. Actually, the union jack is what the flag is called out at sea, but the union flag is what they call it on land.
If you mean union flag / union jack then England Scotland and Wales
it is the union flag on land and the union jack at sea
Union Jack is a noun.
The Union Jack is let to fly on the ships also on sea but the Union Flag is let to fly on Land. That is the difference between the two two flags. Hope this Helps. :) The Union Jack was never called the union flag, The Union Jack was the flag of England
Union Jack Club was created in 1904.
Union Jack dress was created in 1997.
Union Jack - comics - was created in 1976.