What is the name of the official flag symbolizing the union of England, Scotland, Wales, and Northern Ireland?

The flag representing the United Kingdom is called the Union Jack, or sometimes the Union Flag. It's a combination of three different flags representing different parts of the UK. The flag of England, a red cross on a white background, is the St. George's Cross. Scotland's flag, a white diagonal cross on a blue background, is the St. Andrew's Cross. And Northern Ireland is represented by the St. Patrick's Cross, which is a red diagonal cross on a white background. Wales isn't directly represented in the Union Jack because when the first version of the flag was created in 1606, Wales was already united with England. The term "Union Jack" is thought to come from the "jack-staff" of ships, where the flag was flown. So, the name "Union Jack" is a symbolic representation of the union of these nations under one flag. The other options, "Union Ace," "Union Queen," and "Union King," are simply incorrect and have no historical or symbolic connection to the flag of the United Kingdom.