Property Accountability Record System 
Playback And Recording System 
Precision and Accuracy Reporting Syste… 
Private Advanced Radio Service 
PROGRAMMED AIRLINE RESERVATION SYSTEM 
Publicly Available Records System 
Purchase of Accounts Receivables 
ICAO code for Russian Mission Airport,… 
Page Address Registers 
Paragraphs 
Peformance Appraisal and Recognition S… 
Performance Analysis Reporting System 
Performance Appraisal Review System 
Personal Access Requests 
Personal Advanced Radio System 
Personal Audio Response System 
PHARMOS CORP. 
Pharmos Corporation 
Phased Armaments Programming System 
Pilotless Aircraft Reseach Station 
Pittsburgh Air Reserve Station 
Pittsburgh Antique Radio Society 
poly synthase 
poly synthetase 
population attributable risks 
Portable Analyzer for Residual Stresse… 
Postal Automated Redirection System 
Post-Attack Reporting System 
Precision & Accuracy Reporting System 
Pressure-Assisted Reaction Sintering