Initialization of Need To Know -- a slightly more meaningful interpretation.
Used by the same people who ask you to get something done ASAP, but this is just FYI, you old SOB. Now get back to your cube and get to work, or we'll transfer you to BFE.
NTK is also weekly web production self-described as "a useful and interesting UK digest of things that happened last week or might happen next week." Its trademark bare-formatted page contains convoluted pop-culture references like Nathan Barley and Falco, while telling you what's going on in the UK with respect to movies, TV, government, and... candy?
NTK is found at http://www.ntk.net/ and is related to TV Go Home.