| PETRA | Planning Evaluation Training Rehearsal and Analysis 
| Others |
| PETRA | Porsche Echtzeit Trace Analyzer
| Others |
| PETRA | Positron Electron Tandem Ring Accelerator
| Others |
| PETRA | Positron-Electron Tandem Ring Accelerator
| Others |
| PETRA | Preservation Enhancement and Transformation of Rental Assistance
| Others |