What did the acronym NK stand for?

list Andy Smith
Fri, 21 Mar 2014 13:58:53 +0000
Message-Id: <CAFz9LfvcPXt1=sf4ai1r39Kunpnz7+mP+Ff+1=user-2734333a7d31@xymon.invalid>

I know it's not used anymore, but it lives on in the minds of many but just
what was it short for?
Thanks
-- 
Andy