Survivor (American TV series)
Tribes are given different names and colors which are used on the tribe flags, challenge courses, on-screen text, and other items. Each player is given a buff, an elastic ring of material patterned with the logo for their season, that can be worn around the arm, the head. Players have to wear the buff where it can be seen at all times, so the audience can tell who is on which tribe. When the tribes are switched, the players must give up their old buff and get a new one for their new tribe.