What exactly is "NOS"?

[Spartan]

I see guys on here listing stuff for sale as NOS but in my mind it's not really.
If its got a barcode it had to be made after 1970 and possibly later. Also most of the NOS stuff I have found has the yellow and gold GM sticker not the blue. From information on the interweb it could be "goodmark" or dynacorn which are just licensed repops for all intent and purpose.

In my mind putting NOS on something should be significant but I'm finding that this "trickery" is paying off for some who are either misinformed or don't care.

Please educate me. Or what is your idea of NOS?
My Chevelle and Camero buddies say "just because there is a GM sticker, doesnt mean it NOS!"
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