What does “NC” mean?

Question

On some tabs, I sometimes see a "NC" text on top of the tab.

What does it mean ?
How should it be played or interpreted ?

Answer 1

NC (or N.C.) is short for "No Chord".
It means that you should only play the indicated notes or melody, and not try to infer or add a chordal accompaniment. This is as opposed to the chord symbols that you probably find everywhere else than where the N.C. notation is.

See for example
http://www.music.vt.edu/musicdictionary/textn/NoChord.html
(Although their example doesn't use tabs.)