An
Science and technology
    
- An, in mathematics, a root system and its Dynkin diagram
 - An, 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 for electronic equipment named under the Joint Electronics Type Designation System.
 
Other uses
    
- an, a variant of the English indefinite article a
 - An (surname) (安), Chinese surname
 - Ahn (Korean name) (安)
 - An County, in Sichuan, China
 - An (god), in Sumerian mythology
 - An (Shintō), a small table or platform used during Shinto ceremonies
 - Sweet Bean, also known as An, a 2015 Japanese film
 
See also
    
- AN (disambiguation)
 - an, the ISO 639-1 code for the Aragonese language
 - antv, an Indonesian television network
 - Aan (disambiguation)
 - Ann (disambiguation)
 
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