What does the red mark on the red scarf mean?

A corner of the red flag. 1950 From April 23rd to 27th, the Central Committee of the New Democratic Youth League of China held the first national meeting of working cadres for children, and determined the red scarf as the symbol of the Young Pioneers. The red flag is dyed red by the blood of every revolutionary martyr. The red scarf was used as a symbol of the Young Pioneers and was given a new meaning-a corner of the red flag. Every player should wear it, cherish it and add new honor to it.