See also: Appendix:Variations of "nos"
- (medical diagnosis) Not otherwise specified
- diffuse large B-cell lymphoma, not otherwise specified (DLBCL, NOS)
- Near-Online Storage
- Network Operating System
- (initialism) new old stock
- nitrous oxide
Network Operating System
- (Not Otherwise Specified): used as the last qualifier in the definition of a class or category, as a punctuation period that restricts further narrowing of that specification, such as in the UN number for the transportation of dangerous goods; e.g., UN1956 is defined as "Compressed Gas, N.O.S."; whether it is flammable or inert is not specified, so it could be either.