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Yes.
KGB-foam... should be easy to remember, thanks :)
Spectral class: A capital letter out of the sequence: O, B, A, F, G, K, M. (A helpful real-world mnemonic for remembering this is, "Oh Be A Fine Girl, Kiss Me.") This mainly specifies the temperature ranging from O (hottest) to M (coolest). Other letters specify extensions to this classification system, namely: W, L, T, Y, C, S, D. A few of those classes have subclasses such as DA, DB and DC as subclasses of D.
Spectral subclass: Each letter class is then subdivided using a numeric digit with 0 being the hottest and 9 being the coolest.
Luminosity class: A luminosity class is added to the spectral class using Roman numerals.This classifies the stars by its spectral characteristics considering color and brightness. Those spectral characteristics provide information about the type of the star:
0 or Ia for hypergiants
I for supergiants
II for bright giants
III for regular giants
IV for sub-giants
V for main-sequence stars (most of the known stars belong to this class)
VI for sub-dwarfs
VII for white dwarf
Thus, G2 V means: The Sun is semi hot (G), it belongs to the hotter stars (2) in class G and it is considered as a so called main-sequence star (V).
Me too. Thanks for that post, xDuffManx!