| Rank | Abbreviation | Meaning |
|---|
| ***** | PPSI | Pounds Per Square Inch
| |
| ***** | PPSI | Partnerships in Prevention Science Institute
| |
| **** | PPSI | Porous Polyethylene Sheet Implant
| |
| **** | PPSI | Pound for Pound Strength Index
| |
| **** | PPSI | Pressure Per Square Inch
| |
| **** | PPSI | Pioneer Power Solutions, Inc
| |
| *** | PPSI | Physician and Pharmaceutical Services Inc
| |
| *** | PPSI | Policyholder Protection Services Inc
| |
| ** | PPSI | Professional Placement Services Inc
| |
| ** | PPSI | Persatuan Pencak Silat Indonesia
| |
| ** | PPSI | Porous Polycrystalline Silicon
| |
| * | PPSI | Patient Perceived Satisfactory Improvement
| |
| * | PPSI | Project Preventie Sexuele Intimidatie
| |
| * | PPSI | Public Private Service Index
| |
| * | PPSI | Peak Performance Solutions Inc
| |
| * | PPSI | Public Policy Studies Institute
| |
| * | PPSI | Progressive Protective Services Inc
| |
| * | PPSI | Pharmacists Planning Services Incorporated
| |
| * | PPSI | Printing Press Services International
| |
| * | PPSI | Paint Product Stewardship Initiative
| |
| * | PPSI | Public Priority Systems Inc
| |
| * | PPSI | Police and Public Safety Institute
| |
| * | PPSI | Pharmacists Planning Service, Inc.
| |
| * | PPSI | Potential Pollution Source Inventory
| |
| * | PPSI | Peaks to Plains Suzuki Institute
| |