| PAL |
Phase Alternated Line (TV standard) |
| PAMR |
Public Access Mobile Radio |
| PAN |
Personal Area Network |
| PAN |
Public-Access Network |
| PC |
Plenipotentiary Conference (ITU) |
| PCIA |
Personal Communications Industry Association (USA) |
| PCM |
Pulse Code Modulation |
| PCN |
Personal Communications Network |
| PCP |
Private Carrier Paging |
| PCS |
Personal Communications Service |
| PDDR |
Public Protection and Disaster Relief |
| PDF |
Probability Density Function |
| PESC |
Standing Committee on Physical and Engineering Sciences (ESF) |
| PFD |
Power Flux Density (usually dBs[watts.m-2]) |
| PLC |
Power Line Communications |
| PLT |
Power Line Transmissions |
| PMP |
Point-to-multipoint |
| PMR |
Professional Mobile Radio |
| PMR |
Private Mobile Radio |
| PN |
Pseudorandom Noise |
| PNO |
Public Network Operators |
| PP |
Plenipotentiary Meeting (ITU) |
| PP |
Point-to-point |
| PPARC |
Particle Physics and Astronomy Research Council (GB) |
| POFS |
Private Operational Fixed Service |
| PSK |
Phase Shift Keying |
| PSPP |
Public Safety Partnership Project |
| PSTN |
Public Switched Telephone Network |
| PT |
Project Team |
| PTB |
Physikalisch-Technische Bundesanstalt (D) |
| PTC |
Pacific Telecommunications Council |
| PTO |
Public Telecommunications Operator |
| PTT |
Post, Telegraph, Telephone (i.e. government ministry for -) |
| PWAP |
Private Wide Area Paging |
Committee on Radio Astronomy Frequencies