What does 9 P in the S S mean?

Answer:
Nine Planets in the Solar System.

9 planets in the solar system

Unfortunately, this is no longer true, since Pluto was demoted from planet to "Dwarf Planet." according to the Journal of Astronomy. There are now only 8 P in the SS.

First answer by Compendium. Last edit by EPLibrarian. Contributor trust: 354 Question popularity: 4 [recommend question].