Inpatient Prospective Payment System
Institute of Physics and the Physical Society
Independent Power Producers
Integrated Personnel and Payroll System
International Parallel Processing Symposium
Internet Programming and Promotion Service
Independent Payphone Providers
Indian Point Power Station
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Initial Performance Parameters
Initial pre-planned Supply Support System
Initial Provisioning Performance Specifications
inpatient prospective payment systems
International Pelvic Pain Society
International Plant Propagators Society
International Pre-Platonic Studies
Internationally Protected Persons
Internet Presence Providers
Independent Power Providers
International Pension Plans