NOS
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NOS may refer to:
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Science and technology
- Nitrous oxide, also known as nos
- Nitric oxide synthase, a class of enzymes
- Nitrous oxide system, an internal combustion engine
- Not Otherwise Specified, a categorization of illnesses
- Network operating system, a type of software
- NOS (operating system), a CDC network operating system
- KA9Q NOS, a TCP/IP implementation
- NOS stereo technique, for audio recording
Businesses and organizations
- National Ocean Service, US
- National Office of Statistics, Algeria
- National Orthodox School, Amman, Jordan
- Nederlandse Omroep Stichting, a Dutch public broadcasting corporation
- New Orleans Saints, an American football team
- Nitrous Oxide Systems, a subdivision of Holley Performance Products, an American automotive company
- NOS (Portuguese company)
- NOS, the ICAO designator of the now-defunct Norwegian airline, Norway Airlines
- NOS, the ICAO designator of the Italian airline Neos
Music
Other uses
- National Occupational Standards, UK
- National Orange Show, San Bernardino, California, US
- New old stock, unused old merchandise
- NOS (drink), named after Nitrous Oxide Systems
- Nos, Book of the Resurrection, a book by Miguel Serrano
- Nos. or nos., the numero sign, an abbreviation of "numbers"
- Fascene Airport, Nosy Be, Madagascar (IATA code)