Meaning
A plain white flag waving on a pole, the traditional sign of surrender or truce. It means giving up, calling a ceasefire or wanting peace.
In everyday chat it is a funny way to admit defeat, whether to homework, a spicy dish or an argument: “Third bowl of noodles, I give up 🏳️” It also works as a peace offering after a disagreement. Technically it is the base for 🏳️🌈 and 🏳️⚧️, which add colour through hidden codes.