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Pawsey stub - A device for connecting an unbalanced coaxial feeder to a balanced antenna.

PCM - Phase-Change Memory; Pulse-Code Modulation

PLC - packet loss concealment (such as Broadcom uses in the MoGo Talk headset to compensate for lost data while delivering clearer digital voice communications)

PLM - Product Lifecycle Management; Polarized Light Microscopy

PVD - physical vapor deposition