flagging
n.— «Investigators say teenage gangs are loosely defined as, “a group a juveniles who form an allegiance, claim a territory, and wear common colors or articles of clothing.” That practice is called “flagging.”» —“Girl Gangs: Shadea’s Story” by Chalonda Roberts WHAM-TV (Rochester, New York) Feb. 20, 2008. (source: Double-Tongued Dictionary)