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UN update number (SMS)
(en)
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UNB ultra narrow band
(en)
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UNC uniform naming convention (Windows 2000)
(en)
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UNI user network interface (ATM)
(en)
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UNII unlicensed national information infrastructure (mobile communications)
(en)
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UNL universal networking language
(en)
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UNMA unified network management architecture (AT&T)
(en)
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UNO universal network objects
(en)
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UNSPSC United Nations standard products and services code
(en)
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UP user part (ISDN)
(en)
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