PIRR

AcronymDefinition
PIRRPayload Increment Readiness Review (space vehicles)
PIRRPrepositioned War Reserve Interrogation and Readiness Reporting
PIRRPreliminary Investigation Request Response (Raytheon)
PIRRParticipating Individual Ready Reservist (US DoD)
PIRRPeripheral Inflammatory Root Resorption (dentistry)
PIRRPolski Instytut Rozwoju Rynku (Warsaw, Poland)
PIRRPi times Radius Squared
PIRRProject Internal Rate of Return
PIRRParticipating Individual Ready Reserve (Air Force Reserve)