NOS may refer to:
== 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
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).