| p | pico |
| P | Phosphorus |
| Pa | Protactinium |
| PAC | Perturbed Angular Correlation; Photoactive compound; Primary Access Framer/Controller |
| PACVD | Plasma-assisted chemical vapor deposition |
| PA-FTIR | Photoacoustic Fourier transform infrared spectroscopy |
| PAL | Process Automation Language; Programmable Array Logic; Process Asset Library; Phase Alternation Line |
| PAM | Process application module |
| PAS | Photoacoustic spectroscopy |
| PAT | Process Action Team; Program Allocation Table |
| PAWS | Portable acoustic wave sensor |
| Pb | Lead |
| PB | Printed board |
| PBC | Peripheral Board Controller |
| PBET | Performance-based equipment training |
| PBGA | Plastic ball grid array |
| PBL | Poly-buffered LOCOS |
| PBM | Portable bitmap image format |
| PBN | Pyrolytic Boron Nitride |
| PBS | Photon backscattering |
| PBX | Private Branch Exchange |
| PC | Personal Computer; Programmable Controller; Process Control |
| PCA | Printed Circuit Assembly; Policy Certification Authority |
| PCAD | Packaging Computer-Aided Design |
| PCB | Printed Circuit Board |
| PCD | PolyCrystaline Diamond; Kodak PhotoCD image format |
| PCI | Peripheral Component Interconnect |
| PCM | Pulse-Code Modulation |
| PCMCIA | PC Memory Card International Association |
| PCN | Personal Communication and Network |
| PCO | PhotoCatalytic Oxidation |
| PCMP | Post Chemical-Mechanical Polishing |
| PCMS | Plasma Chemistry Monte-Carlo Simulation |
| PCR | Principle Component Regression |
| PCS | Production Cost Savings; Personal Communication Services |
| PCT | Process Change Teams; Macintosh PICT image format |
| PCV | PRISM Controlled Vocabulary |
| PCVD | Plasma Chemical Vapor Deposition (Philips / Dakra) |
| PCX | Zsoft Paintbrush image format |
| Pd | Palladium |
| PDA | Personal Digital Assistant |
| PDC | Passive Data Collection |
| PDES | Product Data Exchange Specification |
| PDF | Portable Document Format |
| PDIP | Plastic Dual In-line Packaging |
| PDL | Page Description Language; Pipeline Definition Language (XML) |
| PDR | Polarization Differential Reflectance; Personal Digital Recorder |
| PDS | Photo-thermal Deflection Spectroscopy |
| PDSA | PeroxyDiSulfuric Acid |
| PDU | Protocol Data Unit |
| PDVC | Phase-Dependent Voltage Contrast |
| PE | PiezoElectric |
| PEB | Post Exposure Bake |
| PECVD | Plasma Enhanced CVD |
| PEDS | Plasma-Enhanced Deposition System |
| PEEL | Programmable Electrically Eraseable Logic |
| PEEL | Programmable Electrically Eraseable Logic |
| PEELS | Parallel Electron Energy Loss Spectroscopy |
| PEM | Photo Elastic Modulator |
| PERM | Pre-Embossed Rigid Magnetic |
| PERT | Program evaluation review technique |
| PES | Photoelectron spectroscopy |
| PET | Post-etch treatment |
| peta | 1.00E+15 (1,000,000,000,000,000/1; symbolized by the prefix P) |
| PETEOS | Plasma-enhanced tetraethylosilicate |
| PFA | Perfluoroalkoxy |
| PFC | Perfluorocompound; Perfluorocarbon |
| PFN | Pulse forming network |
| PFPE | Perfluorinated polyether |
| PFR | Plug-flow reactor |
| PFTQ | Partnering for Total Quality |
| PGA | Pin grid array |
| PGI | Purge gas inlet |
| P-GILD | Projection gas immersion laser doping |
| PGM | Portable greymap image format |
| PGT | Princeton Gamma Tech |
| PH3 | Phosphine |
| PHEEM | Photoelectron-emission Microscopy |
| pHEMT | Pseudomorphic HEMT |
| PHIGS | Programmer's Hierarchical Interface Graphics Standard |
| PHP | Personal Handy Phone |
| PHY | Physical Layer |
| PI | Proportional integral |
| PIA | Parallel Interface Adapter |
| PIC | PC Paint image format; Peripheral Interrupt Controller; Peripheral Interface Controller; Peripheral Interface Circuit |
| pico | 1.00E-12 (1/1,000,000,000,000; symbolized by the prefix p) |
| PICTS | Photo-Induced Current Transient Spectroscopy |
| PID | Proportional Integral Derivative; Process-Induced Defect; Photo-Imageable Dielectric; Packet ID |
| PIH | Pin In Hole |
| PIII | Plasma Immersion Ion Implantation |
| PIN | P-type/Insulator/N-type; Personal Identification Number |
| PIND | Particle Impact Noise Detection |
| PIO | Parallel Input Output |
| PIP | Process-Induced Particles; Picture-In-Picture |
| PIPO | Parallel In Parallel Out |
| PISO | Parallel In Serial Out |
| PIV | Peak Inverse Voltage; Post Indicator Valve |
| PIXE | Particle Induced X-ray Emission |
| PKCS | Public Key Cryptography Standards |
| PKI | Public Key Infrastructure |
| PKIX | IETF Working Group 'Public Key Infrastructure |
| PL | Photo Luminescence |
| PLA | Programmable Logic Array |
| PLC | Programmable Logic Controller |
| PLCC | Plastic Leaded Chip Carrier |
| PLD | Programmable Logic Device |
| PLE | Photo Luminescence Excitation |
| PLL | Phase Locked Loop; Plasma lockload |
| PLS | Partial least squares; Projection of latent structures |
| PLTV | Percentage Local Thickness Variation |
| PLY | Photolimited yield |
| Pm | Promethium |
| PM | Preventive maintenance; Process module; Post meridiem (after noon) |
| maintenance; module; (after noon) |
| PMC | Process module controller |
| PMCC | Pensky-Martens closed cup |
| PME | Paramagnetic Meissner Effect |
| PMEM | Piezoelectric MEM |
| PMI | Phase measuring interferometer |
| PML | Partner Markup Language |
| PMMA | Poly Methyl Metha Crylate |
| PMOS | Positive channel metal-oxide semiconductor |
| PMS | Particle Measuring System |
| PMT | PhotoMultiplier Tube; Program Map Table |
| PMTF | Product Management Task Force |
| PNG | Portable Network Graphics image format |
| PNVS | Pilot's Night Vision System |
| Po | Polonium |
| POR | Process-of-record |
| POSIX | Portable operating system interface for computing environments |
| POU | Point-of-use |
| POUCG | Point-of-use chemical generation |
| PP | Preference Profile |
| PPC | Photo Persistent Conductivity |
| PPE | Personal protective equipment |
| PPGA | Plastic pin grid array |
| PPID | Process program identification |
| ppm | Parts per million |
| PPM | Portable PixelMap image format |
| PPMS | Physical Properties Measurement System |
| PPO | Polyphenylene Oxide |
| PPPL | Princeton Plasma Phisics Laboratory |
| PPRAM | Parallel Processing Random Access Memory |
| PPREF | Process Program REFerence |
| PPS | PolyPhenylene Sulfide (Plastic) |
| PQFP | Plastic Quad Flat Pack |
| Pr | Praseodymium |
| PRAS | Particle Reactor Analysis Services |
| PRAT | Production Reliability Acceptance Test |
| PRB | Pseudo-Random Binary; Physical Review B |
| PRBS | Pseudo-Random Binary Sequences |
| PRDDO | Partial Retention of Diatomic Differential Overlap |
| PRESS | PRediction Error Sum of Squares |
| PRI | Primary Rate Interface |
| PRISM | Publishing Requirements for Industry Standard Metadata; Primary Rate Interface Signaling and Maintenance controller |
| PRL | Physical Review Letters; Property Rights Language |
| PRML | Partial Response/Maximum Likelihood |
| ProgGuiML | ProgramGuide Mark-up Language |
| PROM | Programmable ROM |
| PRSC | Parametric Response Surface Control |
| PRT | Planar Resistor Technology |
| PS | Porous Silicon |
| PSB | Phase Shifting Blank |
| PSC | Porous Silicon Capacitor |
| PSD | Power Spectral Density; Port Status Display; Position Sensitive Detector; Photoshop image format; Programmable System Device |
| PSG | Phospho Silicate Glass |
| PSI | Pounds Per Square Inch; Program Specific Information |
| PSII | Plasma Source Ion Implantation |
| PSIP | Program and System Information Protocol |
| PSL | PolyStyrene Latex |