The Flag of Northern Ireland reference article from the English Wikipedia on 24-Apr-2004
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Flag of Northern Ireland

For people who check facts
Northern Ireland currently has no flag of its own. The Union Jack is used instead.

From 1953 to 1973 Northern Ireland used a flag, called the 'The Red Hand Flag of Ulster', showing a red St. George's cross on white (like the Flag of England), with a crowned six-pointed white star showing a red hand. As this flag is associated with the unionists, it has no chance of being reintroduced. Republicans use the Irish national flag.