n value in coin grading?

I have seen two values on some coin a N value and R value, I know what R is but what is N value? I tried different searches but could not find an answer.
thanks

 

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Got me! Let me know when you get an answer.

Chris

 

Where are you seeing that?

 

What type of coins are we talking about?

 

....

What is the "R" value?

 

R is Rarity, and I think he might be thinking of Newcomb numbers for copper varieties.

 

That's what I considered about the "R" value but without naming a specific issue I had no real idea what the OP meant by "N" value.

 

N?

Numismatic?