An may refer to: . Science and technology. A n, in mathematics, a root system and its Dynkin diagram; A n, in mathematics, conventional notation for the alternating group; Actinide (An), informal symbol for a series of chemical elements; Anode, in electronic schematics; Anorthite, a feldspar mineral; An-, model prefix for the Antonov aircraft manufacturer; A prefix used by the U.S. military ... More @Wikipedia
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