| PAL | Phase Alternating Line / Loop [TV] |
| GARP | Globally optimized Alternating phase Rectangular Pulse [nmr] |
| AC | Alternating Current [engl.] Wechselstrom |
| A-M | Alternating Maximization [Algorythmus] |
| MSAP | Minislotted Alternating Priorities |
| VAC | Volts of Alternating Current |
| ALS | Alternating Layer Spin [engl.] |
| BRAP | Broadcast Recognition with Alternating Priorities [engl.] |
| DANTE | Delays Alternating with Nutations for Tailored Excitation |
| PDSL | Power Line Digital Subscriber Line |
| SDSL | Single line Digital Subscriber Line |
| SDSL | Single Line / Single Pair / Symmetric Digital Subscriber Line |
| PN | Phase Noise |
| TPC | Three-Phase Catalysis |
| PLL | Phase Locked Loop |
| LPE | Liquid Phase Epitaxy |
| PE | Phase Encoded / Encoding |
| PCE | Phase Change Erasable |
| mpic | Mobile Phase Ion Chromatography |
| RPC | Reverse Phase Chromatography |
| PCR | Phase Change Recording |
| bpc | Bonded-Phase Chromatography |
| PCM | Phase Change Material |
| DPC | Differential Phase Contrast |
| TPV | Transport en Phase Vapeur |
| D2PC | Dynamic Two Phase Commitment |
| SCPP | Self-Consistent Phase-Phonon |
| DPO | Data Phase Optimization |
| RPA | Random Phase Approximation |
| RAMP | Ratings And Maintenance Phase |
| PWP | Phase Wobble Prepit |
| PSK | Phase Shift Keying |
| CAP | Carrierless Amplitude Phase [engl.] Codierverfahren bei ASDL |
| DPLL | Digital Phase-Locked Loop |
| LPCS | Liquid-Phase Combinatorial Synthesis |
| cbsp | Chemically Bonded Stationary Phase |
| DAPSK | Differential Amplitude Phase Shifting |
| DPLL | Digitally Phase Locked Loop |
| LEOP | Launch and Early Orbit Phase |
| NPLC | Normal Phase Liquid Chromatography |
| APP | Acoustic Phase Plate [engl.] |
| RRPA | Relativistic Random-Phase Approximation |
| PCEM | Phase Contrast Electron Microscopy |
| BPI | Boost Phase Intercept [engl.] Abfangen feindlicher Flugkörper unmittelbar nach dem Start |
| RPAE | Random-Phase Approximation with Exchange |
| PCTF | Phase-Contrast Transfer Function |
| ORPA | Optimized Random Phase Approximation |
| CPFSK | Continuous Phase Frequency Shift Keying |
| PRAM | Phase Change Random Access Memory |
| DQPSK | Differential Quadrature Phase Shift Keying |