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AC
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===Computing and telecommunications=== * [[.ac]], Internet top-level domain name for Ascension Island * [[.ac (second-level domain)]], Internet second-level domain used to denote academic institutions in many countries * [[AC (complexity)]], a hierarchy of complexity classes found in circuit complexity * AC, initialism of [[access control]] * [[Artificial consciousness]], a field related to artificial intelligence and cognitive robotics * [[Authorization certificate]] or attribute certificate, a digital permission to use a service or resource * [[Arithmetic coding]], a form of entropy encoding used in lossless data compression * alternating component a.k.a. AC coefficient in [[JPEG#Discrete cosine transform|discrete cosine transform]] * [[IEEE 802.11ac]], a wifi standard using 5 GHz, released in Dec 2013
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