| Acronym | Meaning |
![](file.png) | NIS | Neutron Inelastic-scattering |
![](file.png) | NIS | Sodium Iodide Symporter |
![](file.png) | NISO | National Information Standards Organization |
![](file.png) | NIST | National Institute Of Standards And Technology (formerly NBS) |
![](file.png) | NISTO | Non-integer Slater-type Orbital |
![](file.png) | NITEP | National Incinerator Testing And Evaluation Program (Canada) |
![](file.png) | NITFS | National Imagery Transmission Format Standard |
![](file.png) | NITM | Normalized Irreducible Tensorial Matrix |
![](file.png) | NITS | National Institute Of Technology And Standards |
![](file.png) | NIWA | National Institute For Water And Atm. Research [New Zealand] |
![](file.png) | NIWG | National Interagency Work Group |
![](file.png) | NIWR | National Institute For Water Research (South Africa) |
![](file.png) | NIXSW | Normal Incidence X-ray Standing Wave |
![](file.png) | NJTSR | New Jersey Trade Secret Registry |
![](file.png) | NK | Natural Killer |
![](file.png) | NKA | (Na2O + K2O)/Al2O3 |
![](file.png) | NKB | Nachklarbecken; Secondary Settling Tank |
![](file.png) | NKN | Sodium Potassium Niobate |
![](file.png) | NL-SCF | Nonlocal (density Functional)-self-consistent Field |
![](file.png) | NLAP | Nonlimited Aeration Process (for Waste Treatment) |
![](file.png) | NLC | Next Linear Collider |
![](file.png) | NLC | Nematic Liq. Crystal |
![](file.png) | NLC | Noctilucent Cloud |
![](file.png) | NLCR | Nonlinear Continuum Regression |
![](file.png) | NLDA | Nonlocal Density Approxn. |
![](file.png) | NLDF | Nonlocal Density Functional |
![](file.png) | NLDFT | Nonlocal Density Functional Theory |
![](file.png) | NLET | National Laboratory For Environmental Testing |
![](file.png) | NLGI | National Lubricating Grease Institute |
![](file.png) | NLLAP | National Lead Laboratory Accreditation Program |
![](file.png) | NLLS | Nonlinear Least Squares |
![](file.png) | NLLSCF | Nonlinear Least Squares Curve Fitting |
![](file.png) | NLLSF | Non-linear Least Square Fitting |
![](file.png) | NLLSQ | Nonlinear Least Squares |
![](file.png) | NLM | National Library Of Medicine |
![](file.png) | NLM | Nonlinear Mapping |
![](file.png) | NLMO | Natural Localized Mol. Orbital |
![](file.png) | NLMO | Nonorthogonal Localized Molecular Orbital |
![](file.png) | NLO | Nonlinear Optical |
![](file.png) | NLP | Natural Language Processing |
![](file.png) | NLP | Nonlinear Programming |
![](file.png) | NLPLS | Nonlinear Partial Least Squares |
![](file.png) | NLPS | Nonreactive |
![](file.png) | NLS | Nonlinear Schroedinger Equation |
![](file.png) | NLS | Nuclear Localization Signal |
![](file.png) | NLSD | Nonlocal Spin Density (functional Theory) |
![](file.png) | NLSLE | Nonlinear Schroedinger-Langevin Equation |
![](file.png) | NLTE | Non-local Thermodynamic Equilibrium |
![](file.png) | NLXC | Nonlocal Exchange Correlation (potential) |
![](file.png) | NMA | Nuclear Microanalysis |