The shapes, or rather, symbols, on the Australian flag have particular significance. They include the Union Jack, the Commonwealth Star and the Southern Cross.
The Union Jack in the upper left corner (or canton) acknowledges Australia's origin as a British settlement.
The Southern Cross, positioned on the right hand side of the flag, is a constellation visible from all of Australia's states and territories, and which was vital to early ships' navigation.
In the bottom left hand corner is the Federation Star, also known as the Commonwealth Star, a seven pointed star which represents the union of the six colonies at federation. There is a seventh point to represent Australia's numerous territories (mainland and offshore).