The Union Jack on the Australian Flag: Not the UK Flag

Clarifying the Australian Flag's Canton

The flag in the upper hoist (canton) of the Australian flag is the Union Jack (also called the Union Flag), not the "United Kingdom Flag" as a separate entity.

• The Union Jack represents the historical union of England, Scotland, and Ireland (since 1801).
• Australia, as a former British colony and Commonwealth realm, includes it to denote its historical ties and membership in the Commonwealth.
• The Australian flag is a Blue Ensign: blue field + Union Jack (canton) + Commonwealth Star (7 points, federation) + Southern Cross (5 stars).

The UK's flag is the Union Jack. So it's the same design, but its presence on Australia's flag symbolizes heritage, not current UK sovereignty.