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UPN abbr.
abbr.	The Un Popular Network; U Peoples Network; Ubiquitous Public Network; Under Paid Negroes; Unique Property Number; Undead People Naked; universal personal number
abbr., avia.	Uruapan, Mexico
abbr., media.	United Paramount Network
abbr., sec.sys., IT	User Principal Name
abbr., transp.	Used Parts Network