PSU

PSU stands for:

Parti Socialiste unifié, a Socialist Party of France
Partido Socialista del Uruguay, the Socialist Party of Uruguay
Partito Socialista Unitario, the name of three different Italian parties
Passenger service unit, the service units, which are mounted in a plane above the passenger seats
Patch Set Update, see patch (software)
Pennsylvania State University
Personal security environment, an encrypted area of a storage medium with personal data of the owner
Phantasy Star Universe (computer game)
Pittsburg State University
Polysulfone
Portland State University
Power Supply Unit, see Power Supply
Practical Salinity Units, a reference to indicate the salinity
Prince of Songkhla University in Southern Thailand
Prueba de Selección Universitaria, the admission test of Chilean universities
Psychosocial support

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