sukeban
Sukeban (スケバン/助番) is a Japanese term meaning "delinquent girl". The word sukeban can refer to either the leader of a girl gang or the entire gang itself.
The common signifiers of sukeban include brightly dyed or permed hair, in colours of either blonde or light brown. Members of sukeban also modify their school uniform by wearing coloured socks, rolling up their sleeves and lengthening their skirt, which are sometimes decorated with gang-affiliated symbols, kanji and/or slogans. Adding to these features, sukeban usually wear surgical masks, and often carry with them razor blades, bamboo swords and chains, which can be concealed under their skirts.