nautical mile No Middle Initial NASA Management Instruction Nautical Miles Network Management Interface non-maskable interrupt Northeat Midwest Institute NASA Management Instructions National Measurement Institute National Museum of Ireland Non Maskable Interrupt NonMaskable Interrupt Northern Mariana Islands NASA Management Institute National Maglev Initiative National Maritime Institute National Microelectronics Institute National Multicultural Institute Native Method Invocation Naturwissenchaftlich-Medizinisches Ins… Nautilus Memory Interconnect Netherlands Measurement Institute Neutrinos at the Main Injector New Model Introduction Newport Medical Instruments N-methylimidazole no mental illness no more information Non-Major Item nonmethylene-interrupted