What does UPN stand for?

Umgekehrt Polnische Notation - Reverse Polish Notation - Mathematics - German

Union del Pueblo Navarrese - Union of the Navarrese People - Spain - Political party (PPW)

Unique Patient Number (STED)

Unique Project Number (SSD)

Unique Pupil Number - Education

United Paramount Network - Television

United Paramount Network - Media

United Party of Nigeria

Universal Personal Number - Computers

Universal Product Number - Commerce

Universal Program Number (SAUS)

Unpentnilium - Chemical element (EPT)

Upon - Telegraphy (PCTE)

Uruapan - Mexico - Airport symbol (OAG)

User Personalized Network - Computers

User Principal Name - Computers