| Meaning | Category |
| Paul Martin Brown, botanist | Academic & Science->Botany |
| Pembina, North Dakota USA | Regional->Airport Codes |
| Performance Measurement Baseline | Governmental->Military |
| Personal Mail Box | Computing->Networking |
| Personal Message Board | Internet |
| Police Monitoring Board | Governmental->Police |
| Postal Mail Box | Governmental->US Government |
| Potato Marketing Board | Business->General |
| Premier Bancshares, Inc., of Georgia | Business->NYSE Symbols |
| Private Mail Bag | Governmental->US Government |
| Program Management Board | Governmental->Military Governmental->NASA Governmental->US Government |
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