P
- PCL
- Printer Control Language (Hewlett-Packard)
- PCX
- PC Paintbrush
- Portable Document Format
- PEM
- Privacy Enhanced Mail
- PGP
- Pretty Good Privacy
- PICS
- Platform for Internet Content Selection
- POTS
- Plain Old Telephone Service
- PPP
- Point-to-Point Protocol
- PS ó .ps
- PostScript
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