title: N4
text: # N4
  
  N4, N-4, or N.4 may refer to:
  
  ## Computing
  
  * N4 (NHS), the successor to the N3 NHS computer network
  * NASCAR Racing 4, a NASCAR sim by Papyrus and Sierra
  * N4, a Markup Language
  
  ## Energy
  
  * N4 (nuclear reactor), a French pressurized water reactor type
  
  ## Roads
  
  * N4 highway (Philippines)
  * N4 (Bangladesh)
  * N4 road (Belgium), a road connecting Brussels and Arlon
  * N4 road (France)
  * N4 road (Gabon)
  * N4 road (Ireland), a National Primary Route connecting Dublin, Mullingar, Longford, Carrick-on-Shannon, and Sligo
  * N4 road (Luxembourg)
  * N4 road (Senegal)
  * N4 road (South Africa), a road connecting the Botswana border, Pretoria, and the Mozambique border
  * N4 road (Spain), a National Primary Route connecting Madrid and Andalusia
  * N4 road (Switzerland)
  * Nebraska Highway 4, a state highway in the U.S. state of Nebraska
  
  ## Transport
  
  * Fairey N.4, a British reconnaissance flying boat of the 1920s
  * LNER Class N4, a British steam locomotive class
  * Minerva Airlines, IATA airline designator
  * SP&S Class N-4, a steam locomotive class
  * USS N-4 (SS-56), a 1916 N-class coastal defense submarine of the United States Navy
  
  ## Other
  
  * N $_4,$ an unstable molecule of nitrogen (tetranitrogen)
  * N4, a postcode district in the N postcode area of London
  * N4, a Drum & Bass / Hardcore record label run by Pete Cannon. Named after the N4 London postcode district
  * N4 (television channel), a community television channel in Akureyri, Iceland
  * Washburn N4, an electric guitar
  * The second level in the Japanese Language Proficiency Test
  * Nexus 4, an Android smartphone
  * N4, TSMC's 4 nm semiconductor process node
  