Here's what that means:

* G2: This indicates the Sun's surface temperature, which is about 5,778 Kelvin (9,941 degrees Fahrenheit). Stars with this temperature classification emit a yellowish-white light.

* V: This indicates that the Sun is a main-sequence star. Main-sequence stars are fusing hydrogen into helium in their cores, which is the primary energy source for their luminosity.

So, the Sun is a yellow dwarf star.