The black flag emoji represents a solid black flag.
Unicode: U+1F3F4
The black flag emoji depicts a solid black flag or banner, often associated with protest movements, anarchist groups, or piracy. It can symbolize defiance, rebellion, or a lack of allegiance to any particular nation or authority.
"The protesters waved 🏴 black flags as they marched through the streets."
"Ahoy, mateys! Hoist the 🏴 jolly roger and prepare for a swashbuckling adventure!"
"The anarchist collective rallied under the symbol of the 🏴 black flag."