Correct Answer: 9 P in SS is a short form for 9 Planets i Solar System There are many more of this kind Some of them are: 1 7 C in a R - 7 Colours in a Rainbow 2 90 D in a R A - 90 Degrees in a Right Angle 3 52 W in a Y - 52 Weeks in a Year 4 5 C in an OF 5 12 S of the Z
