- A colorless, odorless, and tasteless diatomic gas whose atomic number is 7. It comprises approximately 78% by volume of dry air in the atmosphere, and although as an element is rather inactive, numerous of its compounds are very reactive. It has over a dozen known isotopes, of which 2 are stable. Its applications include its use in thermometers, bulbs, as a refrigerant, and in many compounds necessary for life. Its chemical symbol is N.
- chemical symbol N
- symbol for index of refraction, or refractive index.
- Unusual type of galaxy with extremely bright core, related to Seyfert galaxies and quasars
- prefix nano- or x 10-9
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