Here is a quick entry with a PoD a fair bit before the end of WW1 since it's for a China-dominated world.
I won't do a big writeup since as I said it's a quick entry but long story short the below is the flag of Tianxia - a loose confederation of most states on Earth. It was established after the catastrophic Wars of the Five Directions that devastated the world in the decades following the collapse of the world-spanning Chinese Empire.
View attachment 577527
Symbolism of the flag is as follows:
The Five Colors = five traditional Chinese directions (black = north; blue = east; red = south; white = west; yellow = center)
天下 = Tianxia = All Under Heaven
和諧統一 = Héxié tǒngyī = Harmonious Unity