NK Views 32 meanings found NK commonly refers to natural killer cells in immunology or to data marked as not known, and it is also used informally in government or gaming circles for phrases like 'no kills' or counting children. Medical Not Known Natural Killer cells NeuroKinin natural killer cell Miscellaneous Natural Kitchen Noble Knight Nippon Kaiji Nick Kuris Nirenberg and Kim Not Kewl Norteno Killer Community New Kids Neturei Karta New Knowledge Governmental Narodnyi Komissariat No Kills Number of Kids Night Killer Newark Field Office Academic & Science New Kensington, Pennsylvania, campus of Pennsylvania State U Natural Killer Regional Neo Kenya Nagorno-Karabakh North Karachi Computing Needs Killing New Kernel Noble Knights Internet No Kleenex No Kidding Business Nordiska Kompaniet Nielsen Kellerman Sports Nogometni Klub