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There are THREE crosses represented on the Union Flag. The crosses of St George, St Andrew and St Patrick.
The crosses of St.George,St.Andrews,St Patrick representing England,Scotland And Ireland in The Union Jack unite Britain.
The Union Jack is so called because it is the Union Flag flown from a jack staff of a ship. If the flag is flown anywhere else it is properly called the Union Flag. The word "Union" refers to the uniting of England, Scotland, Wales, and Northern Ireland to form the United Kingdom.
There are two red crosses on the Union Flag. The 'plus' cross is from the English flag and the 'multiplication' crass is from the Ulster flag.
-- Flag vs Jack --The British Flag is called the 'Union Flag', as it is comprised of the crosses of St Andrew (Scotland), St George (England) and St Patrick (Ireland). St David is not included because Wales is a Principality, not a Kingdom.The flag is called the 'Union Jack' when flown from a ship.
The Australian flag has neither strips nor stripes. However, if you are referring to the cross in the upper right hand quarter of the flag, it is the Union Jack. This represents Australia's historical links with Britain. The Union Jack is made up of three crosses representing UK: the crosses of St George, St Andrew and St Patrick.
The Union Jack (Union Flag) is in the upper left-hand corner of the Australia flag. "The Union Jack itself is a composite flag symbolizing the union of the historical components of the United Kingdom. It is composed of intersecting and overlayed red and white vertical and diagonal crosses on blue and white background." Source: http://www.anbg.gov.au/oz/flag-union.html
Union Flag, or more casually the Union Jack
The Union Jack is the nickname of the UK flag.
The Union Jack is actually three crosses, those of St George, St Andrew and St Patrick, representing England, Scotland and Ireland, respectively.
I'm not sure what you mean by 'special name', but the official name for the British flag is: Union Jack
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.