What is "Takeoff Minimum: NA" for US Airports as depicted in Terminal Procedures?
On page D1 of the TPP-Abbreviations

NA.......Not Authorized

Sometimes they give the reason why it is not authorized like in your examples. Other times they don’t. In these cases, you can’t use the runway for IFR departures. (non-Part 91)

N/A.......Not Applicable

I don’t recall seeing this terminology in the departure minimums section, so if you could show me where you found it, maybe I could explain it.