Mathematics and Science
- Acrylonitrile
- Anorexia Nervosa, an eating disorder
- Acanthosis nigricans, a skin condition
- An, a root system and its Dynkin diagram
- An, conventional notation for the alternating group
- Abbreviation of anode in electronic schematics
- AN, ammonium nitrate
- aN, the attonewton, an SI unit of force
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