noun
triangular headscarf; triangle headband; triangular bandana
A triangular piece of cloth worn on the head, often tied under the chin. Commonly associated with traditional workwear, homemakers, or historical settings.
祖母は掃除のとき、いつも三角頭巾をかぶっていた。
My grandmother always wore a triangular headscarf when cleaning.
時代劇では、町娘が三角頭巾をしていることが多い。
In period dramas, town girls often wear triangular headscarves.
Compound of 三角 (さんかく, 'triangle') and 頭巾 (ずきん, 'hood, headscarf'). The exact historical origin is uncertain, but the term describes the shape and function of the cloth.