| Rank | Abbreviation | Meaning |
|---|
| ***** | PIERS | Port Import/Export Report Service
| |
| ***** | PIERS | Pace Institute for Environmental and Regional Studies
| |
| **** | PIERS | Passport Information Electronic Retrieval System
| |
| **** | PIERS | Patient Initiated Emergency Response System
| |
| **** | PIERS | Port Import-Export Reporting System
| |
| *** | PIERS | Program on Innovative Employment Relations Systems
| |
| *** | PIERS | Project to Improve English in Rural Schools
| |
| *** | PIERS | Prevention, intelligence, Enforcement, Reassurance and Support
| |
| *** | PIERS | Progress in Electromagnetics Research Symposium
| |
| ** | PIERS | Progress in Electromagnetics Research System
| |
| ** | PIERS | Progress in Eletromagnetics Research Symposium
| |
| ** | PIERS | Process Institutionalization Evaluation Reports
| |
| * | PIERS | Progress in EM Research Symposium
| |
| * | PIERS | Port Import Export Reporting Service
| |
| * | PIERS | Polarized Infrared External Reflection Spectroscopy
| |