Precise Positioning Service 
Prospective Payment System 
pulses per second 
pulse per second 
Precise Positioning System 
Payload Planning System 
Precision Positioning Service 
Precipitation Processing System 
Parallel Processing System 
Path Protection Switching 
protecte payments system 
Public Products Service 
packets per second 
Pay Per Sale 
Permanent Presentation Status 
Planning Policy Statement 
plant protection system 
post-polio syndrome 
post-postscriptum 
primary power system 
Public Packet Switching 
Partial Page Signal 
Passenger Presence Sensor 
Path Protection Switch 
Payload Pointing System 
Payroll Personnel System 
Peripheral Power Supply 
Peripheral Processing System 
Planning Packages 
Planning Policy Statements