What do all the numbers/letters on the bottom of the cards mean?

[HAL_9OOO]

Hey guys,

Noticed I have a copy of Frodo, Protected by Many but I have no idea what the S means. I thought that was reserved for sites? Might also be nice to get a summary of what all the other types mean too in case other people are looking for the same info. R+ is another one I find iffy. And of course as I understand it the first number is the set, and the second number is the card #(which isn't always right apparently)

Thanks for the help!

p.s: what are those cards that have the "special" themes like a nazgul sword sticking out of the border of the card?

[Tbiesty]

It means it is only available in "Starter decks" I think, not regular booster packs.

[Gil-Estel]

The first number is the set from which it came. The letter next to it can be the following: P, C, U, R, R+ or S.
P = promo, when the first number is a 0
P = premium, startercards from 1-10
P = premium in set 19, you got all of them immediately
C = common cards
U = uncommon
R = rare
R+ = extra rare, only in Reflections. They made all the cards rare, but some where more rare than others, hence the +
S = starter cards in sets 11-13, 15, 17 & 18. Only available in starterdecks, not in boosterpacks.

Last number on the card is the place it has in the set.

[MR. Lurtzy]

Also RF means rare foil (started in set 11) and O means masterworks (the card's template is usually a different color as well)