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| PRR | Policies Regulations and Rules | |
| PRR | Physical Resistance Rating | |
| PRR | Proportional Rate Reduction | |
| PRR | Pattern Recognition Receptors | |
| PRR | Preventive Resin Restoration | |
| PRR | Product Risk Rating | |
| PRR | Pattern Recognition Receptor | |
| PRR | Pro Racing Research | |
| PRR | Packet Reception Ratio | |
| PRR | Pathogen Recognition Receptor | |
| PRR | Preemptive Restart And Resample | |
| PRR | Pennsylvania Railroad (Norfolk Southern) | |
| PRR | Pattern Recognition Receptory | |
| PRR | Preventative Resin Restoration | |
| PRR | Preclinical Reproducibility and Robustness | |
| PRR | Plymouth Road Runner | |
| PRR | Product Release Request | |
| PRR | Peripheral Ring Road | |
| PRR | Print Request Router | |
| PRR | Perfect Resume | |
| PRR | Pulse Rate Repetition | |
| PRR(S) | Pathogen Recognition Receptor(S) | |
| PRRA | Puerto Rico Reconstruction Administration | |
| PRRA | Passaic River Rowing Association | |
| PRRA | Platte River Recreation Access |
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