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PlayStation Portable, a handheld game console produced by Sony Computer Entertainment

Corel Paint Shop Pro, a graphics editor for Microsoft Windows, distributed by Corel Corporation

Payment Service Provider, a company which offers merchants the ability to accept payments

Pacifist Socialist Party, a Dutch political party

Palm Springs International Airport, IATA airport code

Paralytic shellfish poisoning

Pennsylvania State Police

Personal Software Process

Physical Security Professional, a person with certification in the physical security occupation

Phi Sigma Pi, an honor fraternity in the United States

Program Segment Prefix

Progressive Socialist Party in Lebanon

Progressive Supranuclear Palsy

Puerto Rican Socialist Party

Polícia de Segurança Pública, a Portuguese police force

Pierced Steel Planking, airport runway cover

Polysaccharide Peptide

Python Server Pages, a web server facility of mod python

Philadelphia Songwriters Project

Pre-Integrated Solution Platform

Principal States of Polarization

Per-survivor processing, a technique for communication receiver

ProLiant Support Pack, a software and driver collection for HP ProLiant servers

PowerSports Standard Protocol, Motorcycle Industry Council method to streamline the transfer of business data between dealers and suppliers