| Rank | Abbreviation | Meaning |
|---|
| ***** | PSEI | Project Support Environment Interface
| |
| ***** | PSEI | Pro Sports & Entertainment, Inc.
| |
| **** | PSEI | Portal-Systemic Encephalopathy Index
| |
| **** | PSEI | Policealne Studium Ekonomiczno Informatyczne
| |
| **** | PSEI | Public Speaking Evaluation Instrument
| |
| **** | PSEI | Public Safety Equipment & Installations, Inc.
| |
| *** | PSEI | P to S Elastic Impedance
| |
| *** | PSEI | Philippine Stock Exchange, Inc.
| |
| *** | PSEI | Pesticide Safety Education Institute
| |
| ** | PSEI | Physical Science Exhibit Interpretation
| |
| ** | PSEI | Payroll Services Employee Information
| |
| * | PSEI | Public Safety Education Institute
| |
| * | PSEI | Public Sector Ethics Index
| |
| * | PSEI | Polskie Systemy Elektroniczno Informatyczne
| |
| * | PSEI | Post Secondary Educational Institutes
| |
| * | PSEI | Potential Stressful Events Interview
| |
| * | PSEI | Pre Service Educational Institution
| |
| * | PSEI | poststroke depressionand emotional incontinence
| |