I've also seen S rank in Devil May Cry, and Shinobi(?), if I remember correctly. Or the term "S-class" used in anime to describe a super powerful enemy, or someone who is very skilled at something.
Grey Ghost Wrote: [ -> ]Kuu's post makes sense.
Heartless141 Wrote: [ -> ]sounds like Super for me.
Cheesy.... but I thought it was either this or Special, lol.
Special doesn't cut it for me,
Special only means different.
while Super is ... superior...
I've seen P rank in the Suguri doujin games.
Perfect maybe?
Z as in zero, worse possible score which isn't a negative number.
S for Special
A for Amazing
B for Beautiful
C for Cool
D for Dumbass
F for Failure
E for Effort
E is after F in games and it's the worst grade you can get.
I always thought it stood for special or super.
what about Rank SS & Rank SSS?

Nyu~ Wrote: [ -> ]what about Rank SS & Rank SSS? 
Super Special and Super Supreme Special?