The sun is an astronomical object that radiates light, heat, and energy, providing warmth to living organisms on Earth. Though the word "sun" is commonly used, there are many synonyms to describe this celestial body. Some of these words are solar disc, star, daystar, Helios, Sol, and orb. Solar disc refers to the flat circular shape of the sun, while star alludes to the fact that the sun is a star, and daystar is a poetic term that describes the sun's role in lighting up the daytime sky. Helios and Sol are other names for the sun in Greek and Roman mythology, respectively. Finally, orb implies that the sun is a round, luminous object visible to human eyes.