What is the sun's luminosity class?

The Sun is classified as a G2V star in the Hertzsprung-Russell diagram, where "G2" indicates its surface temperature and spectral characteristics, and "V" denotes its luminosity class as a main-sequence star. This classification reflects that the Sun is a stable, hydrogen-burning star that is currently in the main sequence phase of its stellar evolution. Its luminosity is approximately 1 solar luminosity (L☉), serving as a standard reference for comparing other stars.