股长

gǔ zhǎngguzhang

1. person in charge of a 股[gu3] (section or department)
2. head
3. chief
4. director
5. (in a class in a school) student responsible for a specific duty, e.g. 風紀股長|风纪股长[feng1 ji4 gu3 zhang3] discipline monitor

Study it in Yanamino