Australia actually has more than two - national flag, merchant navy ensign, army flag (same as national), naval ensign, air force flag, civil aviation flag, not to mention all the state and territory flags, plus the aboriginal flag.
Same sort of thing applies to other countries, for example, the UK has the Union Flag, red ensign, blue ensign, white ensign, or the USA, which has the national flag and merchant navy ensign. And I am sure many other countries also have multiple flags, most commonly a distinctive flag at sea and for armed forces.
John


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