Nj or NJ can stand for:
- Nanojoule (nJ), an SI unit of energy equal to 10-9 joules
- Nj (letter)
- New Jersey (United States postal abbreviations)
- Napierville Junction Railway (AAR reporting marks NJ)
- Nordjyske Jernbaner, a Danish railway company
- Narva-Jõesuu, Estonia
- Neighbor-joining, a bioinformatic method for the construction of phylogenetic trees. nano- is a prefix (symbol n) in the SI system of units denoting a factor of 10−9 The joule (written in lower case ˈdʒuːl or /ˈdʒaʊl/ (symbol J) is the SI unit of Energy measuring heat, Electricity Because Energy is defined via work, the SI unit for energy is the same as the unit of work &ndash the Joule (J named in honour of James New Jersey ( is a state in the Mid-Atlantic and Northeastern regions of the United States. A reporting mark is an identification assigned by the Association of American Railroads (AAR to rail carriers and other companies operating in North America. Nordjyske Jernbaner A/S (abbreviated NJ) is a Danish railway company operating in Vendsyssel. Narva-Jõesuu ( German: Hungerburg, Russian: Усть-Нарва = Ust'-Narva) is a town in Ida-Viru County, Estonia Estonia, officially the Republic of Estonia ( Eesti or Eesti Vabariik) is a Country in Northern Europe in the Baltic region In Bioinformatics, neighbor-joining is a bottom-up clustering method used for the construction of phylogenetic trees Usually used for trees based on A tree is a perennial Woody plant. It is most often defined as a woody plant that has many secondary branches supported clear of the ground on a single main stem or
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