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P |
| .PCNFS Personal Computer Network File System |
| .PCO Point of Control and Observation |
| .PCS Patchable Control Store + |
| .Personal Communication Services/System + |
| .Personal Conferencing Specification + |
| .Planning Control Sheet + Print Contrast Signal + |
| .Process Control Systems + Program Counter Store + |
| .Project Control System |
| .PCT Private Communications Technology + |
| .Program Control Table |
| .PD Phase-Change Dual + Public Domain |
| .PDA Personal Digital Assistant |
| .Program Database (file name extension) |
| .PDC Primary Domain Controller |
| .PDD Physical Device Driver + Portable Digital Document |
| .PDF Package Definition File + Portable Document Format + |
| .Portable Document File + Processor Defined Function + |
| .Program Development Facility |
| .PDH Plesiosynchronous Digital Hierarchy |
| .PDIAL Public Dialup Internet Access List [Internet] |
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