Solar mass is a unit of mass that is equivalent to the mass of the Sun. However, there are several synonyms for this unit of mass. One synonym is Sol, which is derived from the Latin word for Sun. Another synonym is M☉, which is the symbol used for solar mass in astronomy. Astronomers also use the term solar units, which is a ratio of the mass of an object to the mass of the Sun. In astrophysics, solar masses are sometimes referred to as solar masses or solar-mass stars. These synonyms make it easier for scientists to communicate their ideas about the size and mass of celestial bodies in the universe.