Presumably you're asking about the tiny letters appearing under the portrait of Franklin Roosevelt on the US dime. They're simply the initials of the coin's designer, John Sinnock.
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The abbreviate "js" in text slaying means "just saying." It's usually used at the end of a phrase or thought. You're "just sayin," so no matter what you say, the other person shouldn't get mad, it's more of a joke.
it means that the high points of the coin are really high
Proof
"PL" in coin grading means "prooflike". It is used to describe a coin that has mirror fields and fine details resembling a proof struck coin but is not a true proof.
That number indicates the fineness or purity of the metal content. 900 means the coin is 90% of that metal.