Under the Qing Dynasty, all male subjects were required to wear what specific hairstyle, characterized by a shaved forehead and a long, braided ponytail?

Queue

Qing rulers imposed the queue on Han Chinese men as a visible sign of submission to Manchu rule, and defiant refusal could be punished by death. By the dynasty's final years, cutting off the queue had become a potent symbol of resistance to Qing rule.