Sixth man (fans)

CamCrazies.
The Cameron Crazies of Duke University

In college, high school and NBA basketball, the sixth man is the fans attempting to influence the game by cheering and chanting for their team of choice. The fan section is referred to as the "sixth man", because they are considered the sixth "player" of their basketball team. High school and college student sections are numerous across the United States, and many share the same characteristics.