What does RIR stand for?

RADAR Interface Recorder (MCD)

Range Illumination RADAR

Read-Only Memory Instruction Register - Computer science (IAA)

Receiver Input Register (SAUS)

Receiving Inspection Report

Redgrave Information Resources (SAUS)

Redgrave Information Resources Corp. - Publisher

Reduction in Requirement - Air Force (AFM)

Regimental Inquiry Regulations - British military (DMA)

Regional Internet Registry

Rehabilitation Information Round Table (EA)

Relative Index Register (NITA)

Reliability Investigation Requests (KSC)

Remedial Investigation Report - Office of Environmental Management, Department of Energy (DEEM)

Reportable Item Report - NASA (NASA)

Reporting Interface Record - Computer science (IAA)

Request Immediate Reply - Business term (MHDB)

Reset Indicators of the Right Half (IAA)

Reset Indicators to the Right-half (SAUS)

Resonant Internal Reflection

Rhode Island Red - Poultry

Ribbon-to-Ribbon (IAA)

Ribun - Language code (ETLW)

Richmond International Raceway - Auto racing

Right Iliac Region - Medicine (MAE)

Right Inferior Rectus - Muscle - Anatomy (DAVI)

Riverside International Raceway (SAUS)

Riverside/Rubidoux, CA - Location identifier - FAA (FAAL)

ROM - Read-Only Memory Instruction Register

Royal Irish Regiment - British (WA)

Royal Irish Rifles - British military (DMA)