| Meaning | Category |
| PC Zone | Business->Firms |
| Payment Card Industry | Business->General |
| Per Capita Income | Governmental->US Government |
| Percutaneous Cardiology Intervention | Medical->Physiology |
| Peripheral Component Interconnect | Academic & Science->Electronics Computing->Networking Computing->Drivers |
| Peripheral Component Interface | Computing->General |
| Personal Change Indicator | Community |
| Personal Computer Instrumentation | Computing->Networking |
| Photo-Certified Coin Institute | Miscellaneous->Coins |
| Physical Configuration Item | Governmental->Military Governmental->US Government Governmental->NASA Computing->Software Computing->General |
| Political Correct Indifference | Miscellaneous->Funnies |
| Population Council, Inc. | Community->Non-Profit Organizations |
| Potential Criminal Informant | Governmental->FBI Files |
| Pre College Initiative | Academic & Science->Universities Community->Non-Profit Organizations |
| Pre College Initiatives | Academic & Science->Universities |
| Pre Connection Inspection | Community |
| Product Configuration Identification | Governmental->Military |
| Program Controlled Interruption | Computing->General |
| Prophylactic Cranial Irradiation | Medical->Physiology |
| Prosound Communications, Inc. | Business->Firms |
| Protocol Control Information | Computing->Networking Computing->Telecom |
| Proyecto Concern International Guatemala | International->Guatemalan |
| Prunuske Chatham, Inc. | Business->Firms |
| Pure Custom Imports | Governmental->Transportation |
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