Commonly abbreviated as NOS, this term is used in the automotive parts industry to mean an original part for an old car that is no longer in production nor generally carried in stock by official dealers. A NOS component has never been installed and will generally be in the original packaging, and should be in good condition, thus it is 'new' but at the same time it is 'old' since it was manufactured a long time ago. Provided it has been stored properly, a NOS part is ideal, since it's the 'real thing' and thus will fit correctly (unlike many reproduction parts), look right, and be correct and authentic if you care about such things.