During World War 2 it was often referred to as the 'meatball,' but it would not be politically correct to use the term today.
The Australian flag does not have a nickname.
Wyoming's state flag does not have a nickname. However, the state of Wyoming's official nickname is "The Equality State" which appears on Wyoming's state flag.
Mexican Flag
It doesn't have any nickname.
The japanese flag is a white flag with a crimson circle in the middle.
The japanese flag was made in 600 b.c
The nickname for the British flag is the Union Jack. Although it is only correctly known as this when flown on a ship.
The Japanese flag has a white background with a red circle in the middle.
because it did
The Tricolor
The centre circle on a Japanese flag - is Red.
The Japanese flag.