Click to copy sun emoji symbol🌝, The symbol for the sun is ⊙. The sun is a star located in the center of the solar system. The diameter of the sun is about 1.392 million kilometers. The sun symbol symbolizes a concentrated source of light radiating outward: the source of life from the universe supplies life vitality and energy outward. The outer circle represents infinity because it is a closed loop with no beginning and no end, the beginning and end of time.