Stadium sound is the collective noise made by a crowd of people in a stadium. It can include chants, cheers, roars, rahs, boos, hoots, yells, and hurrays. Chants are typically short phrases repeated in unison, while cheers are more elaborate and involve clapping or stomping. Roars are loud, deep noises that can be heard from far away, and rahs are similar but shorter. Boos are a sign of disapproval, while hoots are a sign of approval. Yells are loud, sharp noises, and hurrays are an expression of joy.