Business

• National Occupational Standards
  National Occupational Standards
  National Occupational Standards specify UK standards of performance that people are expected to achieve in their work, and the knowledge and skills they need to perform effectively.-Definition:...
  
  , people are expected to achieve
• New old stock
  New old stock
  New old stock refers to obsolete equipment, or original parts for obsolete equipment, that have never been sold at retail.The term refers to merchandise being offered for sale which was manufactured long ago but that has never been used...
  
  , merchandise being offered for sale which was manufactured long ago but that has never been used

Geography

• NOS, IATA code for Fascene Airport
  Fascene Airport
  Fascene Airport is an airport in located on Nosy Be , an island located just off the northwest coast of Madagascar, in the Antsiranana Province.-Airlines and destinations:...
  
  , in Nosy Be, Madagascar
• New Orleans Square
  New Orleans Square
  New Orleans Square is a themed land found exclusively at Disneyland, though a similarly themed area can be found within Tokyo Disneyland's Adventureland. Based on 19th-century New Orleans, it was the first new land to be added to Disneyland after the park's opening. The land was opened to the...
  
  , a themed "land" at Disneyland in Anaheim, California

Information technology

• Network operating system
  Network operating system
  A networking operating system , also referred to as the Dialoguer, is the software that runs on a server and enables the server to manage data, users, groups, security, applications, and other networking functions...
  
  , a kind of computer software for running local area networks
• Nokia OS
  Nokia OS
  Nokia OS is an informal name for the operating system in many Nokia mobile phones. These are informal names, there is no such product or trademark, though the term "Nokia OS" is used in official Nokia communications. Officially it is referred as ISA platform. It is a proprietary platform for...
  
  , operating system software for Nokia mobile telephones
• NOS (software)
  NOS (software)
  NOS was an operating system with time-sharing capabilities, written by Control Data Corporation in the 1970s....
  
  , the primary operating system for the Control Data Corporation Cyber line of mainframe computers

Science

• Nitrous oxide
  Nitrous oxide
  Nitrous oxide, commonly known as laughing gas or sweet air, is a chemical compound with the formula . It is an oxide of nitrogen. At room temperature, it is a colorless non-flammable gas, with a slightly sweet odor and taste. It is used in surgery and dentistry for its anesthetic and analgesic...
  
  , N2O, a gas commonly referred to as "nitrous" or "NOS" in vehicle racing
• Nitric oxide synthase
  Nitric oxide synthase
  Nitric oxide synthases are a family of enzymes that catalyze the production of nitric oxide from L-arginine. NO is an important cellular signaling molecule, having a vital role in many biological processes...
  
  , a class of enzymes
• National Ocean Service
  National Ocean Service
  The National Ocean Service , an office within the U.S. Department of Commerce National Oceanic and Atmospheric Administration, is responsible for preserving and enhancing the nation’s coastal resources and ecosystems along of shoreline bordering of coastal, Great Lakes, and ocean waters...
  
  , part of the National Oceanic and Atmospheric Administration
• Neotropical Ornithological Society
  Neotropical Ornithological Society
  The Neotropical Ornithological Society, or Sociedad de Ornitología Neotropical, is an ornithological non-profit organization, with its principal objective the study and conservation of Neotropical birds and their habitats, including both their breeding and non-breeding areas. It was founded in...
  
  

Not Otherwise Specified

• Not Otherwise Specified, a subcategory in systems of disease/disorder classification such as ICD-9, ICD-10
  ICD
  The International Statistical Classification of Diseases and Related Health Problems is a medical classification that provides codes to classify diseases and a wide variety of signs, symptoms, abnormal findings, complaints, social circumstances, and external causes of injury or disease...
  
  , DSM-IV, and many others
  • DD-NOS, depressive disorder
  • ED-NOS, eating disorder
  • MD-NOS, mood disorder
  • PD-NOS, personality disorder
  • PDD-NOS, pervasive developmental disorder
  • PTCL-NOS, peripheral T-cell Lymphoma
  • Adenocarcinoma not otherwise specified
  • Psychotic disorder not otherwise specified

Miscellaneous

• National Open School, former name for the National Institute of Open Schooling
  National Institute of Open Schooling
  The National Institute of Open Schooling , is the Board of Education for open schools in India. It was established by the Ministry of Human Resource Development of the Government of India in 1989 to provide education inexpensively to remote areas...
  
  
• Nederlandse Omroep Stichting
  Nederlandse Omroep Stichting
  The Nederlandse Omroep Stichting , English: Netherlands Broadcasting Foundation, is one of the broadcasters in the Netherlands Public Broadcasting system...
  
  , a Dutch public broadcaster
• New Orleans Saints
  New Orleans Saints
  The New Orleans Saints are a professional American football team based in New Orleans, Louisiana. They are members of the South Division of the National Football Conference of the National Football League ....
  
  , an American football team
• Nine O'Clock Service
  Nine O'Clock Service
  The Nine O'Clock Service was a youth-oriented alternative Christian worship service started, before a 1985 John Wimber Signs and Wonders conference in Sheffield, in 1986 at St Thomas' Church in Crookes, Sheffield, United Kingdom by a group of Christian musicians and artists...
  
  , an alternative worship service in the 1980s in Sheffield, England.
• Nitrous Oxide Systems, a manufacturer of nitrous systems for high-performance automobiles
  • NOS (drink)
    NOS (drink)
    NOS Energy Drink is an energy drink sometimes distributed in a bottle designed to look like a NOS cartridge. It is produced by the High Performance Beverage Company, and licensed by Holley Performance, which owns the trademark...
    
    , a beverage named after Nitrous Oxide Systems
• Nos, Book of the Resurrection
  Nos, Book of the Resurrection
  Nos: Book of the Resurrection is a book by Miguel Serrano...
  
  , a book by Miguel Serrano (original title: Nos: Libro de la Resurrección)