Center for Scientific Production. (Nauchno-Proizvodstvennoe-Ob’edimenie).

-They are the factories where the engines of the Russian brands are produced (probably the updated name of the former GAZ).

-Another thing is the JSC or "Joint Stock Company", name in English of the same industries. For example Energomash appears as JSC and as NPO, due to its composition referred to the shareholding union.