Although I don't know the context, in general, NA probably stands for Not Available. But check our some of the other possibilities at http://www.answers.com/topic/na-abbreviation-1 .
what does IFNA stand for
North America
Natrium (Latin)
No Assets
Yes, "Na" is the chemical symbol for sodium.
It means that the information, in degrees Fahrenheit is "NOT AVAILABLE".
Sodium
stand up Na Na Na another world i should have kissed you
sodium
north america
National Associates
The AxB interaction has (nA - 1)*(nB - 1) degrees of freedom where there are nA levels of A and nB levels of B.