This flag is the symbol of the British navy and the national flag of Britain, and because the flags of British colonies all contain the same pattern, it also symbolizes the British colonies all over the world.
Extended data:
The British flag is called the "British flag", commonly known as the "Union Jack". The existing design has been used since 180 1 and has not been changed since. The national flag includes three colors: red, blue and white, symbolizing different "countries" in Britain. Britain is called the joint king because it is made up of different kings. As we all know, these "countries" include England, Scotland, Wales and Northern Ireland.
The British flag is a witness to British history. The pattern on the British flag looks like the Chinese word "rice", so people in China are used to calling it "rice flag". The pattern of "Mi Zi Qi" consists of three "tens". To be exact, the pattern of the "rice flag" is composed of a regular cross and two oblique crosses.
The pattern of the British flag is a red cross on a white background. The patron saint of England is St. George, and the Red Cross on a white background is called St. George's Cross, so this flag is also called St. George's Cross Flag. It was this flag that was held high during the Crusades. Nowadays, English fans are also waving this flag in the international arena (red and white are the main colors of English fans).
References:
Baidu encyclopedia-British flag