What does the star of the three virtues mean?

Three qualities. By July 20, 2022, excellent workers, excellent workers and pacesetters of learning to strengthen the country refer to the noble three virtues, which is a vivid interpretation of the educational cause loyal to the masses, adhering to the glorious mission of educating the masses and educating the country, and vigorously promoting the spirit of three virtues and inspiring teachers' enthusiasm for work in order to promote the construction of teachers' morality and style.