What is "hachimaki"

A hachimaki (鉢巻, "helmet-scarf") is a stylized headband ( bandana) in Japanese culture, usually made of red or white cloth, worn as a symbol of perseverance, effort, and/or courage by the wearer. These are worn on many occasions, for example, by sports spectators, by women giving birth, students in cram school, office workers, expert tradesmen taking pride in their work, bōsōzoku (teen biker gangs) and even rioters.