A red flag, a brass trumpet, a group of "red scarves", and laughter. What does "red scarf" mean?

"Red Scarf" refers to the Young Pioneers.

Any Chinese student who is over 6 years old but under 14 years old and is willing to join the Young Pioneers and abide by the team charter can apply to the Young Pioneers organization of their school and, upon approval, become a Young Pioneer. Team members should leave the team when they reach the age of 14, and the school's Young Pioneers brigade will hold a departure ceremony together.

Members have the right to vote and be elected in the Young Pioneers organization, and have the right to put forward opinions and demands on the team's work and team activities. Every team member must abide by team discipline, obey team decisions, actively participate in team activities, do the work assigned by the team, and serve everyone enthusiastically.

Extended information

Young Pioneers are the masters of the Young Pioneers organization. Any Chinese student who is over 6 years old but under 14 years old and is willing to join the Young Pioneers and abide by the team charter can apply to the Young Pioneers organization of their school and, upon approval, become a Young Pioneer. Team members should leave the team when they reach the age of 14, and the school's Young Pioneers brigade will hold a departure ceremony together.

Members have the right to vote and be elected in the Young Pioneers organization, and have the right to put forward opinions and demands on the team's work and team activities. Every team member must abide by team discipline, obey team decisions, actively participate in team activities, do the work assigned by the team, and serve everyone enthusiastically.