[1] Packet Ensembly Protocol - schnelles Modemprotokoll für sichere Übertragung (Verfahren für höhere Geschwindigkeiten als MNP5)

[2] Packet Exchange Protocol (Xerox)

[3] Planetary Ephemeris Program (->"IEEE Standard Dictionary")

[4] Program Evaluation Procedure (->"IEEE Standard Dictionary")

[5] Photölectric Photometry (->"Penguin Dictionary of Astronomy")

[6] Packetized Ensemble Protocol (Telebit)

[7] Platform Environment Profile (POSIX)

[8] Productivity Enhancement Project

[9] Programmable Electronics Performance

[10] Power Extension Package (->"NASA Acronym List")

[11] Proposal Entry Processor on HST (->"NASA NGST Acronym List")